Furthermore, many non-GPL OSS projects have eventually gone proprietary (e.g. MongoDB's switch from AGPL to SSPL).
Half the linux foundation's funding comes from 6 companies. Not to mention the full time employees paid to work on it. And I find that there's similar patterns in a lot of other widely used gpl software. Similarly, MIT/Apache software gets tons of contributions from non-corp people too.
https://www.linuxfoundation.org/membership/members/
and that:
https://www.linuxfoundation.org/blog/2016/08/the-top-10-deve...
Every time it happens people are upset and then forget everything a day later. To me non-GPL + corporate involved is a huge flag, especially if it's a more complex or niche project that'd be difficult to fork.