Hey, I agree. I'm always super careful about any ads, addresses etc. But it's pretty shitty for those who ie. are not so aware and for example it's their 1st time with blockchain.info.
Scenario:
A non-tech person with a little computer skills heard about Bitcoin and something about online Bitcoin wallet blockchain. On a hassle he typed blockchain.info into google search
and without enough awareness and knowledge he will create his 1st wallet on a scammy site
this is a possible scenario.
I can think about other scenarios
Even tech people sometimes use google search and sometimes with a strange circumstances they may lost their regular awareness and got scammed by such simple phishing sites.
Well .. also we can say that blockchain online wallet is usually used by newbies or people who for some (strange) reasons like/need to use blockchain online wallet.
If scammers are investing into such ads it must be (perhaps is) working.
I think that Google should pay more attention to prevent such attempts but well ...
Best regards.