I’d suggest that rather than placing a tariff on US services, the EU and indeed the rest of the world just calls in the unpaid tax that US service providers already owe!
Adobe, Amazon, Meta, Alphabet, Microsoft, etc all owe the UK alone approximately £4 Billion in tax.
Tax paid where it is earned should be an EU rule.
Did you know the US taxes its citizens on wages they earn abroad as well as at home?
Yeah, I have some US friends here. Pretty crazy.