The flagship communities are quite alive, but the niche communities have not really taken off. I am talking from both the absence of such communities, and my experience trying to migrate !fluidmechanics. The subreddit has around 10k humans (or bots).

This will be the headline a month later:

Cara’s monthly active users down to a few thousands. Here’s why.

Seems like this can be done in the browser using a user agent switcher.