See if Gab.com's workaround below works. It should because they ran into the same problem with commie Apple & Goongle

Summary Gab is banned from the Google Play Store and Apple App Store for refusing to censor speech for Google and Apple, but you can still install our Android app on your phone.

Get the Gab App On Android:

Launch “Chrome” app

Open Gab.com

Tap the menu icon (3 dots in upper right-hand corner) and tap "Add to Home Screen."

You'll be able to enter a name for the shortcut and then Chrome will add it to your home screen.

Open the Gab app from your home screen.

Get the Gab app for iOS:

Launch “Safari” app

Open Gab.com

Tap the share icon (the button at the center of the footer on the bottom) scroll and tap "Add to Homescreen."

You'll be able to enter a name for the shortcut and then Safari will add the Gab app to your home screen.

Open the Gab app from your home screen.

If you need help we have more information here: https://help.gab.com/article/gab-mobile-app