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A significant number of websites ignore Safari on mobile; not because its Safari, but because its mobile. Not necessarily with a big banner that says "Please use a desktop", but rather a half-assed layout.

Within the US, Safari and Chrome mobile have roughly equivalent marketshare, recently with an edge to Safari. Globally, Chrome mobile is significantly larger than Safari mobile.

None of that actually matters though; Firefox, Safari, and Edge all deploy advanced analytics blocking features which distort their marketshare. In many instances, these blockers self-report their browser as Chrome, as a "blend in with the crowd" strategy.