[samatman]

When I get sent Google Maps links in Messages, they open in Google Maps.

Conversely, Apple Maps links open in Apple Maps. Which won't happen if you've uninstalled that app.

Why isn't it a generic piece of data which can open in any map program? c'mon, you know why.

[Wowfunhappy]

It's more pernicious than that. If someone sends you an address, iOS will turn it into an Apple Maps link. Apple Maps specifically.