So if the actual complaint is "stop supporting for-profit companies," sure (but then we have to ask why - there are reasons to expect that a for-profit company is likely to be more stable long-term, more likely to be secure, etc.). If the complaint is "GitHub / Microsoft in particular is bad, and chatons in particular is good," sure (but then, what about for-profit competitors like GitLab?).
But that's unrelated to the original complaint. As you say, chatons is maintaining OSS services for you to interact with.
Anyway, I am for actually discussing substance so here it is:
With Facebook, you only have one possible landlord - a monopoly. With Wordpress, you have a choice of many landlords who compete on price, location, and so forth, knowing that you can take your business elsewhere.
In short it is like going from digital Feudalism to Capitalism. See this for much more info:
https://qbix.com/blog/2021/01/15/open-source-communities/
That is why I started Qbix 10 years ago. But there is something even better than capitalism and privately owned hosting companies: autonomous, self-balancing networks where dumb pipes carry encrypted messages. Blockchains are just the beginning. That’s why I started Intercoin.org but some projects like MaidSAFE and Matrix.org are ahead of us in many respects (for storage).
For example, my parents are never going to self host their own photos unless they're confident that it is safe and reliable, and takes almost no effort on their part. They don't want that responsibility, and frankly, there's no need.
OSS can be built around businesses that take responsibility and host for others. Part of why so many of these platforms fail to gain mainstream support, is that they're not built to support a solid business case, and instead somehow expect everyday people to learn far more than is realistic, just to replace a service that is free and easy.
That doesn't have to be true. Wordpress, as mentioned above, is a very good example, as it provides both options. (Self hosting, vs. paying someone else to take that responsibility.)