Non KYC BTC

If somebody were to accumulate Non KYC BTC for strictly privacy reasons, later down the track… what could be the potential risks in terms of being able to borrow against it or sell some to an exchange etc since it can’t be tied to you?

I’m seeing a lot of debate about Non KYC and KYC and I’m not understanding why somone wants to buy Non KYC apart from anonymity which is huge in itself , Is there something I’m missing?