Most of these services are US-centric because a lot of the necessary records to provide the information isn’t public in many countries outside of the US.
Birth records, death records, marriage records, divorce records, voting records, criminal records, etc. is considered public information in much of the US. Even address information can be found publicly and immigration records become available to the public after a certain time.
In a lot of countries, especially in many European countries, these are hard to access for people that aren’t the subject of these records, if accessible at all.
For example while court records are public in much of Europe, often times the names of private persons are censored because it’s not deemed necessary to know who the parties are to be able to check if the courts make fair decisions.
This automatically excludes criminal and divorce information from disseminating into the public.
Some countries will make some records public once the subject of those records have passed for X amount of years, but that’s still pretty rare.
As such services like these have limited use outside the United States.