I know, all the time, and thus the entire premise of crypto is flawed, as are the libertarian ideals that birthed it.
Crypto let's you choose who to trust. You can build your own wallet, you can buy one, or you can choose to let someone hold your assets for you.
Many people will choose to trust large centralized parties, and some will choose to generate their own keys offline with code they've verified.
Do they have to trust that any cryptographic libraries they use generate seeds properly? Yes, but there are plenty to choose from that are well known, well tested, and the developers are funded.
It's not as simple as saying "the entire premise of crypto currency is flawed because you have to have some trust." The people that much of the crypto community don't trust are large bankers and governments.
But frankly it’s not that different than cryptography as a whole: nobody implements ECDSA themselves, or builds the computer that runs it, or smelt the metal and assemble transistors that runs the computer, or whatever. There is no such thing as “absolute lack of trust” but some protocols can be “less trust requiring” than others—e.g. more “trustless.”
So pure trustlessness start to finish is impossible. All information exchange requires shared protocols, and this necessitates trust. The idea here is to design protocols which, once the initial setup is complete, trust is no longer a factor.
This isn't just limited to cryptocurrency, it applies to all cryptography, and more broadly, to all security measures of any kind. Key exchange requires initial trust. The idea is that you do the due diligence to get set up, then you don't have to sweat it after. To say the entire system is flawed because setup requires trust is to say that all security measures are pointless.
Still, when we talk about ECDSA and other cryptographic protocols, you can use them without being forced to place your trust in the hands of a single person or private company. There isn’t really a great term to describe that ethos, so “trustless” is often used in place.
