If I upvote a DTube post, then I get a curation reward from them for that upvote. Based on that, the bidbots would get that curation reward for their upvotes or am I wrong here? If I'm right, then the bots get their share for the vote while anyone who pays get less.

25% exists on every single post on steemit, so that 25% is an extra upon that towards dtube? If yes, then bidbots can't really be profitable at all.