Empty threat conditional on something that will never happen.
Most of the rest of the world is too heavily dependent on US digital services to tax them more heavily. From social media to hyperscaler's clouds the US is dominant and stuff will just stop working if they get taxed. There would be a huge pushback from businesses if their government increased the cost of things like AWS.
Edit: edit to say tax more heavily
We're only dependent on American services because we trusted America
Trump has ruined that, so now we'll be moving to build our own alternatives
They're thinking about taxing more heavily because some bright spark decided to tarrif their exports extremely heavily.
Eh? We already tax them. The UK is not alone in having a digital services tax.
…and the US is depending on other markets - mostly the EU and China - to keep growing their economy, because the domestic market is pretty saturated with tech already. This has ripple effects too, because 401k pensions depend on big tech to keep growing, so no administration can risk loosing big parts of the European market.