@leocg Nope! It is turned on, and no site opens in a corresponding installed app. I'm sure I'm doing something wrong, but no clue. I don't even see any option to switch to when I'm in a site that has its app installed.
I'm using a xiaomi redmi note 9s. Android 10, miui 11. Something hidden maybe.
@frack Regarding your second question, it seems to already has the answer on itself.
Your bookmarks stored in Sync servers are encrypted but not your bookmarks themselves.
@leocg No chance. I logged into FB via Opera and then I started seeing the notifications by default. I am very aware of Least Privilege access, so I keep my life run the same way... To me that is a gaping security hole screaming to the world, "Come steal all of my Info and Data". No chance that I would opt into something like that, ever.