Have you discovered some token were disappearing within the market at this period. Such as Bitboost just suddenly disappeared away from market without prior awareness. Should that be? Is that not a cheat?
I think you have misused the term "disappear" here because a coin or token never get disappeared from the market but only get delisted from the exchange due to no demand and regular fall in volume of the coin. The token is not active in the market that's why but it can still be traded if demand rise again.