Why would they not allow wallets to advertise themselves on Google? I can definitely understand a total ban on ICOs, but I don't quite understand the ban on wallets.
Sure, there are probably a number of malicious wallets, but that's the case for any software.
I'm also curious wether they allow other crypto related services to advertise? ICOs, wallets and trading advice aren't the one crypto-related services on offer.
why would a wallet want to spend money advertising itself? do you see Bitcoin Core, Electrum, Armory, Multi Bit, GreenAddress, Bitaddress.org, ... advertise on google?!!! that doesn't even make sense.
so advertising a wallet has an incentive in it. they are either some custodial service like coinbase that need advertising (which means they are not a wallet) or they are scammers trying to spread some malware and earn money that way.