I don’t use mobile apps … but is this behavior much different than desktop downloads?
There’s a lot of software that I’ve downloaded, use a few times, and then never used again.
There’s also a fair amount of software that I use infrequently, but is nonetheless valuable to me. My usage of GIMP, for example, is very stop-and-go. I’ll go a month without using it, then use it a lot for a few days, then not use it again for a month.