Is an app like eBay free in your definition? Because then you have Allegro, which is giant here in Poland. Apps from telcos. Public transit apps. InPost over here is quite big in deliveries. I think Alza in Czechia and Slovakia can easily have a couple million users.
Not very many businesses, but there are quite a few biiig ones.
Here on HN I often read startup stories about services which, on one hand, “nobody” has heard about, and which, on the other hand, “quickly grew to a couple million users and started having scalability problems”, which then spawns some story about scalability tricks. Always leaves me astonished as to how the heck some another glorified todo list/cat picture thing can rake millions of users so fast, but here we are.
I suspect there are way more niches in which tens of millions of users live, which the rest of us can just be ignorant of. It’s only when you approach a billion users that you can be sure “everyone” at least has heard the name of the service/app.
