Whoa I got that too! I usually use Safari or Firefox (Google creeps me out) but I have tested the whole site in all three browsers, except this one button in Chrome I guess :D I'll check it out, thank you!
So apparently we just have to wait until Google's servers decide my app isn't dangerous. Ironic considering I paid the $100 for Apple to notarize the app through Developer ID to remove that same warning from macOS when you first launch the app!