Whoever gets that link can browse it in a web browser.
I've used this to share albums of photos with gatherings of folks; it works very well. It does assume you have your Immich installation publicly available, however. (Not open to the public, but on a publicly accessible web server)
it’s not a fair comparison with Google because Google has a much bigger target on their back. There are millions of users of Google, so the value of hacking Google is very high. The value of hacking a random Immich instance is extremely low.