Practically every FOSS project is actively looking for volunteers/maintainers all of the time. More contributors are not problematic.
The xz problem was that they socially engineered the main dev into giving them the keys to the kingdom.
Making one a maintainer (with merge and possibly even direct commit/push permissions) is handing them a key to the kingdom. Recruiting a maintainer out of the blue without them being already contributor and long term participant in the project is questionable.
I believe that the bad actor was a contributor for several years before becoming a maintainer
Practically every FOSS project is actively looking for volunteers/maintainers all of the time. More contributors are not problematic.
The xz problem was that they socially engineered the main dev into giving them the keys to the kingdom.
Making one a maintainer (with merge and possibly even direct commit/push permissions) is handing them a key to the kingdom. Recruiting a maintainer out of the blue without them being already contributor and long term participant in the project is questionable.
I believe that the bad actor was a contributor for several years before becoming a maintainer
Apparently not, you can check commits in https://git.tukaani.org/?p=xz.git;a=summary the first authored commit was 2022-01-28, then long time nothing until 2022-06-10, the first merge as committer was 2022-12-16.
Interesting! I'd not realised it was so recent