I don't see a real solution. The platform can block SP delegation but the vote bots like smartsteem can't be disabled that easy. They connect directly to you account.
I resented these bots until recently when I started to use smartsteem myself. I chose to vote only on verified accounts and when I check the upvoted content I only see quality posts. It's a good way to use my voting power when I'm not online to help support quality content publishers to jump out between all the spam that's begin published on steemit.