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Can they determine how you want your flag to be placed though? I dont want to delegate to something that generically flags stuff that i might not thing worthy of a flag. I'd want to specifically flag a post through what effectively amounts to a proxy for that flagging. Also, i guess the flagging power of these services would drop pretty quickly, especially if they start hitting some of the bigger investors with their flags.

You have to trust them on how they use it, but you can track that via steemd. You can just as easily withdraw your delegation if you disagree.

I did this with some that flagged a certain Mr H who has been abusing the system for ages. I did flag him directly and got some retaliation.