Yes total number of trades and account age makes a reputation that indicates trust. Also limit raise could be triggered instantly on a combination of account age and number of trades per payment account, as an automated criteria for trust (“PoT”). Number of trades * account age > N. The score can be displayed for self tracking. I think its the best that can be done. It is impossible to guarantee that chargebacks can occur. Hope the guys realise soon that account signing without KYC is totally without hope (useless).
PoT = Proof of Trust