"British" people are far more likely to sing their national songs ("Land of my Fathers" for Wales, for example) than that dodgy imperial song. ( Look at the words. They're really bad, even for an empire. )
Those seem like "how" or "why" questions to me. More complicated. The big one is "how do we prevent" and I bet we won't get an honest answer from big social themselves. That's why there should be independent public research.
fedia's Terms of Use and Privacy Policy are blank, so who knows who runs it and what their political views are? I'm testing it but I'm not supercomfortable recommending it yet.
There's sayboard and some other Vosk-based tools but only on android, as far as I know.