If they can't work things out with google/android, then they just need to make the app available for download and also put it on the alternative sites to google play. People WILL figure out how to install it if it's available. That's what GAB did. There's no good reason for not having done that but there was no good reason for taking months to put out the web app since it's made from Mastadon - https://en.wikipedia.org/wiki/Truth_Social#Software
It's really been a piss poor project from the beginning.