Bleach 6.0.0 cleans up some issues in linkify and with the way it uses html5lib so it's easier to reason about. It also adds support for Python 3.11 and cleans up the project infrastructure.
I did some rough testing with a corpus of Standup messages data and it looks like bleach.clean is slightly faster with 6.0.0 than 5.0.0.
Bleach sits on top of html5lib which is not actively maintained. It is increasingly difficult to maintain Bleach in that context and I think it's nuts to build a security library on top of a library that's not in active development.
No, I won't be passing Bleach to someone else to maintain. Bleach is a security-related library, so making a mistake when passing it to someone else would be a mess. I'm not going to do that.
I'm not aware of any alternatives to Bleach. I don't plan to work on coordinating the migration for everyone from Bleach to something else.
I think that gives the world enough time for either something to take Bleach's place, or for the sanitizing web api to kick in, or for everyone to come to the consensus that they never really needed Bleach in the first place.