Around 70% of the users are on mobile, more specifically. However my point still stands - even if only 10% of the desktop users pick an ad blocker, this means at least 3% less ad revenue for Reddit Inc., it's quite a bit.

Another thing that they could be doing is to create a bunch of rules that would displease mobile users the most, but that would not be detected as "targetting mobile users". Such as banning for emoji usage, or for writing "R/subreddit" instead of "r/subreddit", this sort of stuff. Aiming at actually destroying the subreddit, so people migrate elsewhere.

But for that they'd need to accept that their Reddit communities are lost, and yet most of them are still wallowing in that "no, we can recover Reddit!" wishful "thinking".