Admob - terrible CTR in new app


Couple of days ago i’ve released my new game. ECPM on banners is very very bad (all my games have pretty low ecpm, but this new game has it even worse). For yesterday (saturday) i had over 10K impressions and CTR 0.04%

I’ve analyzed targetting type of ads and noticed that “placement” type has smilar CTR, but “Contextual” and “Interest-based” are much worse.

So, this lead to another question - how admob know what contextual adds to provide to an app? Does it use app description? Or it learns over time?

Currently, most users come from my another app. Also ads are displayed same way, game is in same category (brain & puzzle). So apps should performance simillary.