I have heard that there are some exchange platforms that deceive traders and even owners of new coins, Tell us your story with a bad exchange platforms that you do not recommend.
Help others to avoid this exchanges that cheat traders
I think there are already many trustworthy exchanges, Coinmarketcap released hundreds of the best exchanges. You can see and choose it there. If you say there are exchanges there that commit fraud, you can report with the evidence you have. I think, you should not take an opinion in this matter without giving a concrete proof.
Exactly, we should be very careful when choosing an exchange because there are many fakes exchanges generating volume through Bots, that's why we should always prefer higher volume exchanges which are listed in Coinmarketcap. Without researching it is not advisable to install their wallets in mobile.