I think you underestimate how many people use Safari.

Nowhere near as how many people use Chrome obviously, even on Mac.

Data from analytics.usa.gov [1] reveals that Chrome leads browser usage at 48%, closely followed by Safari at 35.7%, highlighting the competitive proximity of Safari to Chrome. Definitely much higher share than I thought.

[1] https://analytics.usa.gov/

Those would almost entirely be from iPhones where all browsers are technically Safari

Not for long. IFF you are geographically located in the EU and using an iPhone (not iPad), you may one day have the option to use an alternative browser engine. You know, once browser vendors get around to making a version of their app that conforms to Apple's asinine requirements.

The whole malicious compliance shebang. EU mandates browser choice, so Apple implements new technological measures to ensure that browser choice will still not be offered outside the EU

“Safari” doesn’t mean “Safari Desktop”. We’re talking about the Mac here.