If there is interest in this content, users will create a Lemmy community and post content there.

This is clearly not true. Content is missing and not everyone takes the initiative to post to help bootstrap communities. We don’t have content here because we don’t users, and we don´t have users because we don’t have content.

Maybe they will even link to the sportsbots mirror.

Which would be fine, except that sportbots mirror does not have a page of its own. It is built in a way to just push the updates to its followers.

I had proposed to Lemmy devs a system to let people post ActivityPub content directly, but this was considered more trouble than its worth (to them).

But don’t just set up a script to do it for you, that’s just something people are going to block.

Not everyone