Having the objective of eliminating abuse is unrealistic at best, all we should strive for is to dissuade it as eliminating it isn't only very difficult but will come with restrictions on everyone else. Like it has been mentioned, the curation change isn't in addressing bidbots or self voting, though like you said it might make people who self vote spread their votes out more. I think bidbots would suffer greatly if they couldn't calculate how much each delegation is supposed to receive if the curve wasn't convergent, which simply means they can round it, but if the curve was exponential it would be hard if not impossible to determine how much each delegation will receive since the order that the delegations come in changes how many vest they would have. That coupled with a handful of free votes, especially if they could be delegated so projects like SFR could use them, would make running bidbots or buying votes that much more risky. We can't hope to stop them, but we can dissuade them.