In 2019 they also performed a retroactive terms of service change and after the backlash they changed their TOS to basically say "this can never ever happen again"

A few months before this recent dumbfuck decision, they actually went back and removed the part of their TOS and that they couldn't make retroactive changes to the TOS and then hoped everyone forgot.

What they've done this time was a calculated business decision where they knew they'd piss people off and just expected most to suck it up and deal with it like they have every other time. They calculated very poorly here though as this was just the straw the fucked the camel raw and everyone is jumping ship. They have proven repeatedly they aren't an engine development prioritized company anymore, they have proven repeatedly that have no issues lying to paying customers and doing shady backdoor shit.

What they did a few days ago was a "whoopsie we tried to fuck you again" and for the second time have promised that this retroactive change can't happen again. A second promise days after they broke that promise.