Profit smokes people's heads off, just like with anything related to it.
Banks are just there for the opportunity too, and it's our choice to give them such with our BTC.
People will give their bitcoins to banks, that's inevitable because banks have all the power and resources for that. The majority of Bitcoin holders are here for the money and the majority of them don't know how to use self-custody wallets.
Banks might have the resource but they lack the power. With DEXs and CEXs already available, most users don’t need banks. They will mainly attract those who are not familiar with self-custody.
People who won't read between the lines would probably be exposed to BTC through said banks: unfortunately, they have all the influence to make it happen.
But those who will take their time to understand why their custody matters would never choose such an option.
Those set of people should be living in the stone age in the 21st century. I see no reason people in this present era where information flies faster than light will choose to stay in the dark when Bitcoin related topics are discussed almost everywhere on social medias. I don't think there is a justifiable excuse for trusting banks with the rate of sensitization going on about self-custody. The least anyone who feels ignorant about the trend can do is ask questions.