To me it is another data point corroborating two things:

• The large majority of "reddit protestors" really have a short attention span, and were not really interested in putting a fight against Reddit. As soon as the subs started opening again, it became a display of virtue to say "Fuck /u/spez", but they all happily went back to the status quo.
• Reddit is taking a look at this and thinking "we won", which will embolden them to be more aggressive towards their plans. Mirroring content now is our best shot at creating a hedge against a future Reddit that will not hesitate to take more user-hostile actions if they think can increase their revenue.

Yeah, but I think I'd still like to have an alternative that is part of the Fediverse. I know that the Discourse devs are working on it, but I am not aware of any actual working deployment.

I'm actually okay with the mirror capability of fediverser, after all I'm the one that is developing it. :)

It's a bit more sophisticated than a simple mirror. It creates a 1:1 mapping between reddit accounts on the alien.top instance, which can then be taken over by the reddit users .by login via the portal.

But therein lies the dilemma: I know that this tool is helping to bootstrap communities, but I also understand that some admins are against it. I have it already set up my system at alien.top to collect the posts from /r/NixOS, but I'm not going to push them to any community unless I get explicit approval from the mods and admins.