A startup cannot enshittify if you don’t allow it to start up.
Once it starts up, gains traction, and the network effects kick in, you lose the power to do anything about it.
The only time you can kill a venture-capital funded startup is at the very beginning.
The way you kill a startup is by not using its free services at the start.
The correct answer to a venture-capital funded startup is always “no, thank you!”