As a counterpoint, most people use their phones daily while sitting on the toilet and very rarely sanitize it. You may be diligent in keeping it sanitary but the past 50 people who kept their phones on the table while reading the menu probably didn’t (and the wet rag the bus person wipes the table down with probably doesn’t do much either).
I do not believe that most people use their phones on the toilet at all, much less daily. It would be incredibly stupid to risk dropping your phone in the toilet just so you have something to look at for the <1 min it takes to do your business.