At which point people won’t afford their products and they’ll have to concede. Or, better option, push everyone into FOSS operating systems and renew interest enough in Ubuntu Touch, Postmarket OS, or any of the mobile Linux distros to see widespread divestation from Google, Apple, Amazon Web Services and Microsoft. Nothing but good comes from taxing the rich.
The only way we fail is by not trying. The rich want you to believe it is impossible to tax them, it is not.