[dochtman]

No, they don’t.

Selling support contracts is actually hard.

GPL/AGPL preclude widespread adoption (these days) — the grandparent explicitly mentioned “permissive” licenses.

[astrange]

All businesses are hard, but I don't think selling support is especially hard for one. The above two are how x264 development was funded, but it's also how Klara works for BSD and Igalia for web browsers.