You would need to be relatively trusted in forum to even get clients, Because 3 weeks is enough to withdraw to a bank account or a credit card, And the dispute "should work" and PayPal would be in negative -them having the loss
Yes but that doesn't effect the buyer.
buyer would still not get the BTC and have 3 weeks wasted + dispute time. You would require significant trust or using a middleman as well "Paxful or LBC".
You're right. But it is obvious this service is meant only for those who are not accepted by regular exchange services (e.g. cannot/don't want to provide ID or fund source). Do you think it won't be useful for such people? I've been there a while ago and had bad time finding a way to exchange my PP without ID hassle and/or terrible losses.