Unless it's a scam, the situation is self-correcting, i.e. bad agencies don't stay in business. The lone exception is when they are the only game in town.
In that case it won't do the OP much good to ask for a list of of "worst K-agencies", since it would be short lived because of the name changes. The better question for OP to ask is "who are the reputable agencies", because their names have staying power.
rentry did, or at least used to, do that. But it is likely better if they get help rather than everyone just expecting someone else to do all the work and then take advantage of that effort.
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