Tumblr? Tf u mean? It's still doing pretty well, MySpace lost all content posted before 2016 and is now a useless empty husk. Tumblr is just smaller, but still active. This comparison makes no sense.
Eh, its still massively less popular than it used to be before they banned porn, if something similar happens to Reddit, with it becoming a ghosttown in parts of it but still fairly active on larger communities- I'd still consider that a win against them.