How do you get people to use it? Like let's say I have drinks plans with my friend, and I want to bail using this service. How to I tell her to install the app

How do you get people to use it? Like let's say I have drinks plans with my friend, and I want to bail using this service. How to I tell her to install the app? Wouldn't asking her to install it be pretty rude? It would basically be saying "Hey, FYI I like to bail on stuff a lot. So you probably shouldn't make any plans involving me." I could see that stigma as a critical roadblock against growing the kind of user-base you'd need for this to get popular.