> IBM makes tons of money off of Linux, for example.

Personally I would rather contribute to a GPL licensed project, because if big companies try to profit of it, they will also have to release their changes. Those could improve the project, and now the community does no longer have to do themselves -> Community devs get payed back in development time that they would have to spend themselves.

With permissively licensed projects (or commercially dual-licensed), where big companies are allowed to just take and improve it internally without giving anything back to the community, a community dev would pretty much be an unpaid developer for those companies.