You are helping - they clearly need the additional training, and you’re doing everything you can to supply that. Their job can’t be relying on you.
They shouldn’t (and almost certainly don’t) have delegation authority.
For corporate bingo, the keywords are upskill, cross-training, and bus factor.
There are some public numbers on how many occurrences are found each year on the major platforms.
IIRC, Facebook deals with around 75 million reports per year. Twitter, Reddit, and others were around 20 million reports per year.
I don’t know how many are dealt with on Mastodon or Lemmy (or how you’d even get reliable numbers for that), but something tells me it’s a lot less than the bigger platforms these days.