If you receive an address in an iMessage, clicking/long-holding will always open in Apple Maps. There is no way to share to Google Maps (it doesn't appear in the list), and the default setting to use Google Maps doesn't affect iMessage.
You have to copy the address, switch to Google Maps, paste it in, and search. I would much prefer clicking the address to open in the app of my choice.
If I click on an address received via iMessage, it will open the "default app for navigation". If I long press it, the context menu will say "get directions" which opens the "default app", open in "google maps" if it's set as the default app. There's no option to open it in Apple Maps. If the "default app for navigation" is Apple Maps, everything I said above changes to Apple Maps.
If I click "share", Google Maps doesn't show up in the list, but neither does Apple Maps.
Where is that setting?
Settings | Apps | Default Apps has no option for Navigation (iPhone SE 18.5, in New Zealand). Maybe EU thing?
* Navigation (in some countries and regions1) –– choose another app instead of the Apple Maps app to use when opening links for a location
I don't have this option in the US.
However, when I use Google Maps, I do have the behavior described elsewhere in this thread: it constantly bugs me to open the links in chrome (which I’ve never had installed) even though I always click “use default browser”. Googling something in safari also regularly prompts me to install chrome.
I can share just fine from messages to other apps like Tesla or other mapping software like ABRP. I don’t see a Google Maps share provider anywhere on my device though
Google maps and google.com shouldn’t prompt either. No prompts.