Custodial services like coingate know two things:
1. The Bitcoin train is going to leave the station soon (so collect as much as possible before then).
2. Custodial services days are also numbered (and so is confiscating peoples money for "AML" reasons)
I don't agree with the second part of your statement. I don't think their days are numbered at all, and there is a big market for custodial services. The reality is, most people don't know and don't want to be in control of their own money. They want others to do it for them with guarantees that everything will be all right. That's the way we have been molded to think for hundreds of years. Don't use this forum and its members as your basis that people enjoy non-custodial services, multisig setups, and complicated airgapped systems. The average person doesn't want that responsibility and prefers something easier and more convenient. They are ok with less secure custodial services and their arbitrary rules.
Custodial services will be replaced my services that run on code and that are decentralized. If innovation continues, that's the way things are headed. Decentralized exchanges have already taken a big chunk from custodial exchanges, decentralized lending has begun to disrupt traditional lending. Within 20 years (maybe soon) custody will be replaced by code.
Education will also get better, so doing things yourself will only get easier over time as well.
Not to mention how many times per year we are reminded that custody services lead to loss.
It might sound unrealistic though so did the concept of Bitcoin 20 years ago I'm sure. I am very confident in my statement.