I get your point but this is not a thread about Signal. Threema is a lot less common of a topic on HN than Signal and the only reason I’m using it and am familiar with it is this feature so I don’t think it’s such an off topic question to ask.
Repetitive discussions are off-topic so hanging one off a different, more specific topic is a lot more than somewhat off-topic, it end up being thread vandalism, however well-intentioned or outright unintentional.