I don't live in Jamaica but I just saw a user complain his service goes out
at the same time his local provider does.

The provider is Flow Jamaica and they seem to get service via C&W Caribbean
according to another poster.

Service going out together likely means there's shared infrastructure. And
buying Starlink as backup and having it fail hard without rerouting several
times in a row is below expectations.

There's another provider in Jamaica. Digicel that seems to have separate
infrastructure but that might not be value for money to have alternative
connectivity.