I tried it and there is no way I am returning.
I found that running your "mine" requires looking at ads that are so obtrusive they hit you with popups - and of the insidious type that like to claim your computer is infected (one claimed it was from Microsoft and that you needed to call them to clear the problem). Besides the lack of ethics of the blatant lying, it basically crashed my chrome tabs by locking up my browser with a popup within the popup that could not be escaped. Forget it. Not worth it, not ever.

At least the old MBM, while it had ads, didn't have anything nearly as obtrusive. Good luck to anyone who wishes to keep playing it, but I thought it worthwhile to put out this message to A) warn others considering trying it - in its current state, and B) give feedback to the creator of the site regarding the fact that this kind of ad-support makes the game unusable - at least to me (I'm sure several people would agree).