It doesn’t really matter what kind of block it is. Vivaldi comes with TLS (Transport Layer Security overlay), but it is not necessarily turned on if its an old install. If a fresh profile has it turned on, then all traffic leaving the browser are encrypted and cannot be tampered with. you can check if it is turned on–
go to Vivaldi://flags
All i follow on youtube are archaeological channels, and i was surprised by the sudden influx of videos on israel the very week israel started attacking. I noticed one channel that was hosting an israeli co-host stopped collaborating very soon, and months later posted a very nuanced, very politely angry video. But the number of videos establishing the legitimacy of israel all at once at that time cannot be anything but planned. Even National Geographic had a video out on the origins of Israel, at a timing that is so very suspect.