I don't understand why this relative metric matters. Past the size of a small city it just shouldn't matter how many more users the competition have. There are more firefox users today (~200M) than there were total internet users in 1998 (~150M), and surely you would agree that it does not make sense to discard that, any more than it makes sense to discard, say, UK or France from diplomatic relationships because they have ~70M inhabitants while India and China account for almost 3 billion.

Hmm it matters because when everyone basically uses competition, it doesn't matter if a few people use something else

Just because only 17M people live in the Netherlands, does not mean it's OK to block them. Just because people in wheelchairs don't wall, does not mean we don't need to build streets such they can get around too. Just because some people use the Greek script, does not mean ASCII is enough.

It's called accessibility, and it's a very good thing.

You are arguing against a straw man