Ideas and suggestions.

Therefore, in my opinion, incorrectly clicking "start over" should be treated the same as incorrectly exiting the game. That is, it should be considered an admission of defeat.

I agree. But I repeat – it all sounds good on paper. In reality, it's like the final season of Game of Thrones, and I can't imagine anyone having the courage to repeatedly pressure their opponent into restarting the game.

The fact that there is a need for additional confirmation on the host's side is completely irrelevant to the situation. If it really happens by mistake, he has already made a mistake and is sure that he needs to restart and will confirm it. And in the case of abuse, he will not hesitate and will confirm it.
So, only confirmation from the second side can improve the situation.