tl;dr
Tachiyomi will no longer be actively developed. It may continue to work for you for the foreseeable future but there will be no support for it nor the official extensions.

I'm sad to announce that, with unanimous support from the fellow core contributors and support staff, the core Tachiyomi project will no longer be under active development due to recent events involving Kakao Entertainment Corp's threats to both myself and others that have been involved with the project.

https://tachiyomi.org/news/2024-01-13-goodbye