“When you use Signal, your data is stored in encrypted form on your devices. The only information that is stored on the Signal servers for each account is the phone number you registered with, the date and time you joined the service, and the date you last logged on.”
It’s not really that tall of an ask to install one more app - especially one that asks for nothing, you’re not taking away anything, you’re adding.
People are weird.
I don’t know. People can’t keep up with everything (like tech privacy news) in life and now out of their 100+ contacts this one person wants them to switch to this different app that nobody else seems to be using.
From their perspective it’s kinda pointless