I'll grant you that this all depends on how it is implemented. Hypothetically, it could just be a service - I sincerely doubt that's what it would be.

For one thing, with SPV clients, I think this service essentially already exists. If someone is willing to trust someone else to validate blocks because they're squeamish about block data, they can just connect to a few nodes they trust with a light client.

There is no need for some complex solution where it's difficult to determine the risks and long-term consequences. Unless you wanted to muddy the waters and confuse the nontechnical. I can see the arguments now: "It is trustless though! Trust us!"

My other point is Why is this service suddenly required now? It's long been known there is illegal data in blocks. Nobody seemed to care a year ago. And with all the financial infrastructure etc. built up around bitcoin, I doubt anyone will.

So why is this narrative being amplified now? If we step back and interpret this in the full context of the knots drama, it seems fairly obvious to me. Ultimately, this is about control. The knots crew aren't getting the code changes they want, and are willing to create a false crisis, slander all other bitcoin devs, roll out lawyers, and more, if they think it'll give them the control they want.