The problem here would be the companies would have to respect those tags and right now they don’t respect any such rules. In theory, you should be able to exclude them via robots.txt on your website, but most of their crawlers ignore them.
@paperdigits I am aware that rules are not respected currently, I think this is a very long haul and some high profile court cases are necessary to reign in big tech.
I also think it could be useful to support what I think (big fat think) is or is becoming an industry standard. When/if such tags will be respected, it would be nice that they are in DT