1- Un regulated brokers.
2- Brokers offering Fund management services most of them are scams and their gains are not to be trusted as they can manipulate results.
3- Either their trading priviliges or track record aint verified.
4- Duration : usually with smart martingale the accounts can last 6-7 months or even an year producing 10-30% profit per month, those systems are not to be trusted.
5-FXBOOK UPDATE : there accounts are never updated, or set at high time periods, so that if they blow their accounts they just stop the updates, a real trader uses Fxbook e.a to update it every minute or 5 minute.
6- Negative Pips = meaning the trader is using very dangerous martingale or cost averaging strategies.
7- Hidden history or lots.