No later than last weekend I was comtemplating migrating my family pictures to a self-hosted Immich instance...
I guess a workaround Google's crap would be to put an htpasswd/basic auth in front of Immich, blocking Google to get to the content and flagging it.
Add a custom "welcome message" in Server Settings (https://my.immich.app/admin/system-settings?isOpen=server) to make your login page look different compared to all other default Immich login pages. This is probably the easiest non-intrusive tweak to work around the repeated flagging by Safe Browsing, still no 100% guarantee. I agree that strict access blocking (with extra auth or IP ACL) can work better. Though I've seen in this thread https://news.ycombinator.com/item?id=45676712 and over the Internet that purely internal/private domains get flagged too. Can it be some Chrome + G Safe Browsing integration, e.g. reporting hashes of visited pages?
Btw, folks in the Jellyfin thread tried blocking specifically Google bot / IP ranges (ASNs?) https://github.com/jellyfin/jellyfin-web/issues/4076#issueco... with varying success.
And go through your domain registration/re-review in G Search Console of course.
Thank you for the "welcome message" suggestion! I'll implement that in the hope it may help in the future.
Immich is a great software package, and I recommend it. Sadly, Google can still flag sites based on domain name patterns, blocking content behind auth or even on your LAN.
That probably wouldn't work, I get hit with Chrome's red screen of annoyance regularly with stuff only reachable on my LAN. I suspect the trigger is that the URLs are like [product name].home.[mydomain.com].
I'm actually already avoiding this issue but for another reason: hackers will scan subdomains matching known products with known vulnerabilities, so hosting a Wordpress behind "wordpress.domain.tld" will get you way more ill-intentioned requests than "tbyehl.domain.tld".
Thus if I started hosting my Immich instance, I would probably put it behind "pxl.domain.tld" or something like that.
Not a garantee to pass the Google purity test, but, according to some reports, it would avoid raising some redflags.