Three years ago, #FDroid had a similar kind of attempt as the #xz#backdoor. A new contributor submitted a merge request to improve the search, which was oft requested but the maintainers hadn't found time to work on. There was also pressure from other random accounts to merge it. In the end, it became clear that it added a #SQLinjection#vuln. In this case, we managed to catch it before it was merged. Since similar tactics were used, I think its relevant now
@eighthave Yeah, comments pushing for quick merges instead of adding actual code reviews, or for handing over maintainership altogether, should immediately raise some flags in maintainers' minds. Personally, I found that further probing and asking for actual contributions were good strategies to evaluate intentions.