At this point, you clearly show that you have no understanding of export regulations or sanctions, and you're basically arguing that there can't be any because you've seen a well known company not block all access outright.
Get legal advise if you run a business. Don't do legal based on a hunch or an internet discussion.
It'd be pretty sad state of affairs if I had to hire a sanctions lawyer (they are a fair amount more expensive than regular ones) so I can sell, say, icon packs on the internet, but fortunately, that is not the case.
The reason Google's GCP block is outrageous is that they are on a mission to become one of the backbones of the internet, and as such, they are on a mission breaking the internet in US sanctioned countries. You defend this based on the largely misguided notion that US sanction law is so aggressive and unpredictable, that anyone one running a website would be better off with an auto-block of those countries, or risk his freedom.
In reality, the lack of such an auto-block from currently much larger providers (by multiples), and a lack of enforcement actions that could have been prevented by such a block, would tell us that this is FUD.
Get legal advise if you run a business. Don't do legal based on a hunch or an internet discussion.