On my iPhone, I was able to create a Gab icon that functions just like an app. Basically you navigate to Gab on your mobile browser and create a shortcut to your home screen (Safari is best for this). You then get a shortcut with the Gab logo and it functions just like any other app.
Have had the same, for FR, for years on my iPhone
Bookmarking thread.
Now that I learned the trick, I did the same with FR as well.