Recently FUN and RISE delisted from Bittrex.What are the reasons that exchanges delist coins? Is there any way to know that any exchange going to delist any coin?
There's no way that we will know that the coins will be delisted by certain exchanges. Perhaps the only indication is that the coins hasn't been pump in the last couple of months, meaning low volume. Or they are no news from the dev itself about the roadmaps and their plans about the coins.
Although last year, when some coins were delisted, most of the devs cry "unfair" because at the background they said that they are still much active though and that they haven't been given enough time by the exchanges.