Comment by TeMPOraL

Hm, interesting. I always assumed people making money on these streaming services (through both ads and premium accounts) aren't the same people as those who upload movies to them (actually, to somewhere else; these services now aggregate links to players, mostly).

I believe they're more popular than Torrents because they shield from responsibility. At least over here at Poland, your legal problems only start when you're actually infringing copyright - reproducing the work, i.e. uploading - which makes Torrents risky, but HTTP streaming fully in the clear for the viewers.