1 SEARCH- GOGGLE
Google has users worldwide all over the world I think because it has been used worldwide that could be one of the reasons they make tons of money or maybe through the advertisement they have.
2 transaction- Remitly
Remitly is an online money-transferring app where people send money digitally from one country to another. one way they can make is that every time people send money to one another they charge depending on the amount you send.
3 information- code academy, Chegg
apps like code academy, and Chegg are online studying apps that offer tutorials and free helping through these apps. I only way they make money is through subscriptions. they charge you every month. Codecademy and Chegg are known widely and all over the world.
4 entertainment-amazon prime
amazon prime has been used widely all over the world just like Netflix people use amazon prime all over the world just like that they also make money through subscriptions as they charge every month.
5 saas- picktochart
picktochart is an online apps where you can go and create posters on their website and download it for free.
6 community- twitter
i think twitter is as famous as facbook and instagram are they are lots of people who dont know each other sames as they dont know each other on facbook or instagram but they still talk and chats with each other.