They don't just believe in their selves, always doing copy trading which sometimes,
Copy trading is used by beginners that just want to gamble, they will end up losing just like you have said.
Another one are trading signals, the newbies will also later end up losing because they are just taking trading as gambling and just like receiving predictions.
There is nothing better than to learn trading and have the experience, using the money you can afford to lose.
they don't know thr amount the person use in openings the trade, someone can used $2k to open a trade, unknowingly to you, copy the same trading strategy and use $200, when the market start going against you, complaints starts immediately and your accounts will get liquidated
It does not mean, either you use $200 or $2000, the liquidation price depends on the leverage used not the amount used.