Yeah, but the copyleft makes anything they build around it a derivative work that they also have to release sources for - especially with AGPL. Most don’t want to do that because that’s where their IP lives.

Not all open source licenses are copyleft licenses (e.g., MIT very much isn’t), but at the very least copyleft licenses make it much harder to exploit open source code commercially without giving back in some way, whether that’s code, or cash for a commercial license.

Not perfect, by any means, but definitely an improvement over more permissive licenses.

I am aware of how much I’m starting to sound a bit like RMS in my old age.