i think the whole thing is about the payout. If there was not payouts then nobody would care. For example i think a profile that always uploads memes (that probably are stolen) or just a single photo per day isn't considered quality. About the photography one i am talking about photos of a shoe, of a bottle in general ''useless'' photo that show that the person just wanted to upload something. Meanwhile a single photography can have deep meanings ( μια εικονα χιλιες λεξεις)
Also it's not the same when someone makes general posts or in a specific genre and once in a while he posts a gif or meme. He doesn't lose his quality i think.
At the end of the day it's as you said what please us and if i may add we are the ones who casts our votes too!
I am 100% with you on that
Even though I don't really like to put labels. For example "he is a writer" or "he is a scientist"
In fact I would urge people to start posting about different subjects as long as they keep a standard quality. Imo variety matters!
As for those examples you mentioned...yeah there are also trash post around and of course I am not talking about these. I hope that's clear :)