Progress has been slow implementing FEP-5624. Even slower than the C2S implementation. For those who don't speak techno-babble, FEP-5624 is a specification that brings comment permissions to Mastodon and the rest of the ActivityPub universe. It's about bloody time. We've had them for years. C2S is "Client to Server"; which is a specification for dedicated mobile/desktop apps and their interaction with ActivityPub.
The cool thing about FEP-5624 is that a conversation owner can reject a comment to their conversation container and the commenter can't just send it to all their friends anyway. It will be rejected unless it carries a verifiable stamp of approval from the conversation owner.
What's bad about this spec (and the reason we didn't do it this way to begin with) is that we are forced to interact with spammers instead of just throwing their shit in the garbage and being done with it.
Anyway I thought this was a three day effort but it has turned into three weeks. That's OK. It will get done when it gets done. If you're building ActivityPub or fediverse software and haven't implemented this yet, you better get crackin'. This isn't "optional". Once this is rolled out in Mastodon, ActivityPub comments as we once knew them will cease to exist.