Bringing flowers to a grave once a year is not gonna distract regulars from the fact that you do zero to upkeep it during the other 364 days of the year.

Same here, these subs just aren't the reason why I used to be on reddit or why I'm on lemmy now. I used to be low profile on reddit (and actually liked when people thought I was the allo-cis-het man they assumed me to be because it made my posts look so funny at times), but I've found lemmy to be less misogynistic so far and I've seen a fair amount of users with pronouns and fairly filled out profiles so I thought I'd give mine a try too. So far nobody has ever used them, but we'll see.

This isn't meant to bash OP's cause, I'm sure someone finds these communities useful, it's just not for me.

That looks really promising, I never heard of that before, thank you for telling me! Do you perhaps also know of any unofficial tumblr android app that lets me add two accounts/main blogs (ideally FOSS, but I'm willing to make compromises)?

Fully agree.
I'm one of those people who migrated to tumblr after the Reddit exodus (tbh I did have tumblr beforehand, but my usage increased a lot when the API bullshit happened). After using it for around 10 months I've come to the conclusion while yes, it is good for fandom related content, memes and some other things it's simply no replacement for reddit (it's actually more of a replacement for my fandom instagram to me). Yeah you can follow hashtags or topics, but tumblr is too niche of a platform and a lot of the topics I care about the average tumblr user doesn't even think of, or at least not to the extent I do.
If you want a reddit replacement Lemmy is simply your best option. If you want a Twitter replacement then yeah, go ahead and use Mastodon.

Thank you Mr. Torvalds.