Most people, including contributors submitting merge requests, don’t actually need to know who the maintainer is. As a maintainer (and also as a translator), I have received direct email out of nowhere for topics that clearly belonged in a public space like an issue tracker or a mailing list. For MR all that matters is that someone eventually reviews, but it could be a developer. Actually, I can cite Fractal as a piece of software where the two people listed as maintainers are doing the least reviews currently amongst the dev team, and are probably not the ones you want to reach out to for most questions. Dani and I are maintainers because we take care of maintenance tasks (e.g. doing releases, project management…), and while we are also developers of the module, we are not the ones driving the current efforts.
So, if this is indeed a question that you have seen in issues and merge request, can you expand on the reasons why someone would actually need that information?