When there are reciprocal markets between countries with similar approaches to government and law, there isn’t much of a problem. When one country adds tariffs, the other usually just matches them.
Closest I can think of are Ocado and Monzo, neither of which (especially the latter) are big enough to compare yet. Perhaps Just Eat (UberEats competitor) too which recently announced US partnership with Amazon. (Veering off-topic here but I've long been surprised that Deliveroo hasn't massively expanded globally? That's the dominant one in London at least, and very quickly ate Just Eat's lunch, which long predated it.)
Skype, Shazam, iZettle, Mojang etc
I’m not sure it would be different for social networks. (similar to how the match group owns practically all the dating sites and apps; interestingly I just found out that the match group refused to pull out of Russia.)