Very much so, although I'd perhaps argue Twitter's worse in that regard, with endless "best photos about X" bots happily swiping photos (often scraped from Redd

Very much so, although I'd perhaps argue Twitter's worse in that regard, with endless "best photos about X" bots happily swiping photos (often scraped from Reddit, sometimes even other such bots), inserting advertising into their streams, and making quite significant money off photographers' work. With Reddit users, it's done without commercial gain. (Speaking as one who's had their work lifted thusly, particularly this one, "Momentary": https://500px.com/photo/43052792/momentary-by-porsupah-ree https://500px.com/photo/43052792/momentary-by-porsupah-ree. It hurts, especially when there's not even any attribution, let alone any attempt to offer or agree on some modest fee)