@mash_graz Calm down! What the developers of Natron achieved until now is absolutely fantastic! We now have a good quality compositing software for free. They own my full respect.
It's ok to be concerned about the direction Natron may be heading with those registrations, but your complaints are a bit exaggerated. Natron is OPEN SOURCE! Everyone can download the code in just a minute. There is no restriction at all. You know that, as you are compiling it from source. Open Source doesn't necessarily mean that it doesn't cost anything or it's not allowed to collect some information. It's absolutely possible to sell open source software as long as the source code is provided. Of course I prefer free software without any registration, too. But is it really that big of a deal? The developers now stated more than once that this information is valuable for them. Can't you give them a bit in return? I mean it's not very sensitive data at all that they want to have. And you can put in a fake name if you want...
It's part of their bussiness model which you obviously don't like. But have you thought about how important a good bussiness model is? You may have noticed that the pace with which Natron is being developed is extraordinary. I mean compare that to some other open source softwares (of course there are some very actively developed ones, but there are also a lot, that are progressing very slow, becaus the developers do it in their spare time). You have to keep in mind that it's three developers that created Natron in such a short time! This was only possible, because they had a proper funding. You just can't expect developers to work full time for free, they have to earn some money, too. If you are so against their business model, you would either have to live with the consequences of no business model resulting in a much slower development or you have to propose a well-founded bussiness model yourself. But just complaining doesn't help anyone.
Please don't get me wrong. I'm all in favour of software that is as free as possible. But as MrKepzie stated before, if they want to go one with the same pace, they need the money for three full time developers. I think currently it's almost impossible to get that amount with donations as the userbase is still to small. So if you don't want the development to slow down or to even stop in the worst case, you need a propper business plan.
Yes, there is Kickstarter and it works for Krita, but Kickstarter is really not optimal for continuos development. I mean the whole 'all, or noting' approach. And you have to spend so much time with the campaign, and the rewards. Additionally 5% of the funding are going directly to Kickstarter and don't forget the money you need for all those rewards.
Ok, Blender has the Blenderfoundation. They rely on donations and have established a development fund. That's currently 5400 Dollars a month. How many fulltime developers can you hire with this? And keep in mind, blender is there for over 20 years and has a huge user base as it is less a niche product. Of course there are some additional doations. They now tried an additional business model: a cloud subscription. Maybe you don't like that, too, as there is also a need for a login. But that has led to additionally 20k a month which they can use to improve blender.
I myself am happy that the developers try to pull off a sustainable business model. We will all benefit from it, when it works, so lets just wait and see, if it works out. In the meanwhile we all can think of other sustainable models that could be added or switched to in the future.
For example: I recently stumbled across www.snowdrift.coop and they seem to have an interesting concept. I now joined their team and who knows, maybe in the future some FLOSS projects get sustainably funded this way.
Btw: You are repeating how stupid this decision of the developers was and how much harm it will do to the project. But at the moment you seem to be pretty much the only one who really complains about it and doesn't want it to be true. There are a lot that don't really like to have to register, but it's not a big deal for them. Again, don't get me wrong. I'm happy that there are people like you who are very engaged in the FLOSS world. But believe me, there are a lot of people out there that are less extreme in terms of FLOSS and prefer to have an actively developed application over a rarely updated one. Me included.