Buying KYC accounts or having someone else KYC these days is no longer so difficult, and they are very cheap.
Why would you ever want to do that? It's against the terms of use on almost every exchange. If KYC is your concern, then just don't use an exchange that demands it.
How likely is it that the exchange will block your funds for no reason? Is there such a statistic? This is often talked about in the community, but no one knows how often it happens.
Isn't not knowing how often it happens more concerning that knowing?
For many years of using such exchanges, they have not blocked me a single account that is registered to another person.
Maybe it just happened. Their terms of use make it clear enough that you must not share the ownership with another person, unless you have Binance's consent.
7.2. Sole benefit. By opening a Binance Account you agree that:
a. where you are an individual user, you will use your Binance Account only for yourself, and not on behalf of any third party, unless you have obtained our prior written consent;