I read an article awhile back that Android and Apple both have them after they did updates some time in the past, I know mine is off (for now) but when you go to settings and then choose google, it shows a covid tracker. Everybody I have told with an Android looked and it was there. My mom said her Iphone has it also but not sure how to find in on an Apple phone.
There is a vanity thread here, maybe 3 weeks or so old, on how to uninstall it and attempt to keep it from being re-installed. It worked for my Android. I don’t recall if they discussed Apple.