Cpm drop was bound to happen because Bbs token mining supply is fixed at 500 millions max, given the recent price drops it makes sense to lower the supply of token in order to maintain long term goal of Bbs, otherwise token will get finished before we even have an app🙂.

The other important thing to remember is that high supply of token will lead to more Bbs price dump, cpm is Bbs engagement mining difficult level, however unlinked BTC it is not controlled by code. And not it is not fixed. It basically follows the market.