There are worlds of a difference between a project like chromium or Android, which is basically dependent on Google, or random little open source projects run by some fellow nerds. The latter kind of open source is always perfectly fine IMHO, unless the people are confirmed assholes. And there is a wide middle ground containing a lot of the open source ecosystem.
I think there is a valid point in avoiding heavily corporate dominated open source, but this is just a few big problematic fish in a huge ocean.
I wish for a general alternative to Duolingo similar to what it was before it was completely enshittified and turned ads and gems for money up to the maximum.
Before, like 5 years ago, I considered Duolingo subscription and I felt it provided good value. But what it has become now is just disgusting me.