The US has forever been ignoring jurisdiction boundaries just like that. Ever heard of FATCA? Banks anywhere in the world need to report US-resident account holders to the IRS.

They enforce it only on businesses targeting EU residents.

What do you think the US does when I start a business here, say a webshop selling legally allowed recreational drugs, also targeting US consumers?

Huh, haven't you heard of offshore sports betting site owners getting arrested? Also, remember kimdotcom?

Why not? The US does it all the time.

You mean like the US does to Huawei?