[mmwelt]

The problem is the networking effect. Since so many people use iOS, even Android users often have to contact people on iOS devices, resulting in Briar likely remaining very niche.

[kragen]

Very few people in my country use iOS devices. Maybe 5%.

[SahAssar]

There are like 15 countries where iOS market share is below 5% according to https://worldpopulationreview.com/country-rankings/iphone-ma...

Granted, a few of them are very large/populous like india, bangladesh, pakistan and ethiopia, but in the grand scheme of things iOS is probably more popular than you think.