And instead of peddling hypotheticals about what your instance will/won't do, it would benefit you to make an account on one who has admins that will listen to your pleas or have similar inclinations towards content as you.
Or I could use a service that employs an army of content moderators to ensure that I am likely never to be placed at legal liability due to content someone else uploaded to the platform.
I tried Mastodon about two or three years ago; I used the largest instance I could find that claimed not to allow Adult content, but which still relayed other instances. I was shown pornographic content as soon as I logged in; some of it illegal in my country.
So I tried another instance that made similar claims. Same problem.
Maybe it's better now. Maybe it's no longer awash in loli hentai or cartoon beastiality.
I tend to recommend people find a small server with frienda and friends of friends if they want a public feed they can trust. Or simply follow people they trust to not post illegal content and ignore the firehose. That is what I do. Mastodon is basically an RSS reader for me.
I upvoted you but all I'm hearing is that you want people to do the work for you while you don't spend a cent or a drop of sweat on the problem. It has a whiff of entitlement in my opinion.
Even better: you can use Mastodon with an RSS reader. All tags and profiles produce RSS feeds. In theory, a feed reader could be ActivityPub aware and support comments/replies for feeds from AP platforms.
I only see things from people I follow. It is perfectly valid to use Mastodon like an RSS reader.