I personally think some types of openly developed software projects should have a strict non-commercial license: if companies aren't willing to contribute back to the source IMO they shouldn't be granted permission to freeload & have volunteers fix issues their paying customers run into

Donations are possibly a bit of an exception here - there are quite a few companies that still do this, albeit growing slimmer by the day.

Another big problem IMO is the subset of users that start attacking maintainers and volunteers because their "free app stopped working" etc. I see that a lot, mostly in the arduino community, but especially egregiously on the Zabbix project - I imagine a lot of those users are companies who aren't even paying/donating to the project