Absolutely correct. If something has various features, like prediction market in Trust Wallet, it is not a must to use this feature. I have Ledger wallet, but that I have never used swap feature, never bought directly crypto with fiat and never had Ledger crypto card. No doubt that heaving such features shortens way from money you have to placing a prediction, but I think people still will prefer popular Polymarket to prediction build-in feature.
Of course, the majority might prefer Polymarket, but we shouldn't overlook the vast number of people who simply place bets for the sake of it without analyzing underlying factors or employing specific strategies. Given the ongoing trend in prediction markets, Trust Wallet is poised to capture a user base of people who place bets while commuting home from work. For them, it is a form of leisure a way to get a thrill and an adrenaline rush and there are millions, even tens of millions, of such casual players worldwide. Trust Wallet will undoubtedly profit from this.
Of course everyone will have its own client, but I still think that people will chose to access Polymarket and make a deposit to place a bet, than skip few steps and do basically the same in Trust wallet. I think such thing as crowd effect will work. If everyone use Polymarket and it is popular, then I will also use it, even if there are alternatives.
Why I would also use Polymarket instead? Because psychologically, when there is something original and copycat, then I think that copycat is always worse, does not have all features, is less convenient and etc. If there is something original, nothing can be 1:1 like it is and give same experience. But that is just my feeling.