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Well i would recommended delegating to any from this list if you are looking to support ethical bots.

If you are looking for the best return i'm not sure..... i haven't tested each one.

I delegate to @brupvoter as i think they were the first to cap losses, i'm very happy with them as they return about 20-40% APR you can check their payout stats here https://www.brupvoter.com/en/graphs_roi_sponsors.html