Depends on how you use the exchanges. If you just buy and sell BTC and keep your coins off-exchange, there is little reason to care about whatever schemes the exchanges are doing. If you start playing with leverage, you will be putting much more trust at stake, and it is your individual decision to do that. I have been involved with BTC community for many years and most Bitcoiners I know do not trade back and forth, do not buy that much shitcoins and do not store their coins on exchanges, so these schemes do not affect them.