While Blekko was active there really were one three reasons we could be "forced" to de-index a site, it was being used by a 'bad' country (N. Korea, Iran, Etc.), it was serving up CSAM, or was participating in Ad fraud. Now Microsoft also would delist places that were in the crime underworld so they wouldn't index the <random-string>.ru sites and things like that. They should be able to give you an answer though unless they have an NSL that says they can't talk about it.

That makes me wonder if web sites that have "anti government / anti ICE" content will start getting delisted by US web indexes.