[hightrix]

For the same reason that ads in reddit comments are unmarked. The law hasn't caught up yet. There are countless "guerilla marketing" campaigns across reddit that are not identified as ads. I expect AI will be no different and it'll take the law a decade+ to catch up.

[threetonesun]

Every ad in Reddit is clearly marked. I'm not being obtuse - obviously Reddit, the internet, magazines, TV, all do some form of subliminal advertising, astro turfing, paid placement, etc, but we're talking about two different things from Google's business perspective, and I still doubt they are as interested in the latter as they are being the search leader and putting well paying clients right up front in bold (and underlined) letters.

[pseudalopex]

Small low contrast Promoted where posts have small low contrast time is not clear marking. Fake comment ads are a little more clear.