What do you mean under "necessary" information?

Because you can use e.g. Robosats to buy btc. There you don't have to share any personal information. Only seller shares their fiat payment address, and you send them the money. But the receiver will know your name.

But there you have to make trade off, as you can't sell any time, any size, and maybe your fee (premium) will be higher than compared to custodial such as strike. But you shared no personal information.

In this way, the necessary information can depend on the level of service you prefer.