How I got everyone to use Signal:

"The only messaging app I use is Signal, or you can send me an SMS"

Even my Steam friends message me on Signal.

Otherwise I just refer to alternatives as if it's obvious.

"Yeah I saw this meme on Lemmy which reminded me of you"

"What's Lemmy?"

"It's like Reddit but less corpo"

"Cool"

Sometimes when I'm drunk I'll just install Tubular on peoples phones and tell them its YouTube but less shit.

As for my Window-cucks, I'll just send them Linux memes about how shit Windows is.