Go to a mall in Bangkok and you will lose count of the number of people walking around with iphones. I don't know what you consider a "tier 2 and tier 3" country, since I think you just made that up, but maybe you should travel more.
I guess Bangkok holds 28% of Thailand population then.
https://gs.statcounter.com/os-market-share/mobile/thailand
Also the issue being discussed here are Apple computers with M1, even less than those 28%, in case you also want numbers.
Don't say
"the issue being discussed here are Apple computers with M1"
when your comment said
"Please list tier 2 and tier 3 countries where there is a significant market share of Apple hardware."