[Viliam1234]

Increased transparency would be having "Advertisement" (no abbreviation) and the advertiser's icon.

Replacing "Ad" with advertiser's icon is simply a method how not to display "Ad". I expect that many icons will not be company logos, but rather something that seems like it would normally appear in a web page: a small arrow, a tiny dot, a thumb-up, etc.

Then the Google will have credible deniability: hey, we didn't make the icon, the advertiser did, blame him. But of course they are the ones who refuses to display "Advertising" clearly.