I don’t know much about politics in Serbia but it’s hard to imagine that there’s anyone in the world for whom this grovelling before Russia for the “mistake” doesn’t make him look like a complete loser.

Seems to me one of the main things that got people to move away from Whatsapp en masse a few years ago was a rumour that they’d added a backdoor to it similar to the one Sweden is thinking of demanding. If an unfounded rumour did that much, the real thing might do substantial damage to Whatsapp as well if they were to go along with it. It probably wouldn’t completely demolish it, as it would for Signal — or at least its demise might take longer.

The “average person” you have in mind who obviously does not care about cryptographic security also does not use Signal.

If they did that, Signal would no longer exist at all. Nobody anywhere in the world would want to continue using it.

The “if” to that “then” being that if they pass a law that would make Signal illegal in Sweden, then Signal will leave Sweden.