exactly. i don't understand why people feel the need to blame antirez. he wouldn't do that if he still ran the project anyway

The best way to ensure that the license doesn't change is to forego copyright assignment. So if someone is really committed to making sure that license will never change, that's what they'll do. Antirez didn't do that

That only works for copyleft licenses. Even with Antirez' original work fully available under BSD, there is nothing stopping Redis Labs from adding new code under a proprietary license.