It’s worse than being reversible. The problem is that it’s unprovable. A switch from “zero logging” to “log everything” is wholly undetectible to users. You have to rely on blind faith that a profit-driven entity will act in your interest and resist their opportunity to profit from data collection. All you have is trust. Tor avoids that whole dicey mess and reliance on trust.
You say for suspicious users, but for the 4-month stretch of beehaw being unreachable there was no opportunity to login. So there was apparently a user agnostic systemwide change.