Devils advocate:

The poor showing of migrated communities - both low volume of migrations, and poor performance of the servers running them, isn’t helping the cause.

Like, I look at that list and the broken-overloaded lemmys running them and I can’t help but think this is why Reddit is successful and will continue to be successful. Because very, very few will put up with such a poor experience the alternatives offer.

Of course, if there’s some serious effort put in asap into the usability, stability and overall experience of the decentralised communities approach, then Reddit may falter. I’m not optimistic.