Looks like tariffs on services are possible and are being considered, together with a bunch of other options.
https://www.politico.eu/article/eu-tariffs-counter-strike-big-tech-us-banks-donald-trump/
Big Tech oligopolies are largely parasitical. If you slapped a 100 % tariff on them, replacing them would be painful but possibly not all that inflationary. (Compared to, say, rebuilding a car manufacturing supply chain from scratch.) A 30 % price increase for Office365 was apparently enough to make millions to switch to LibreOffice! Try 300 % and see.