What about....
You almost fooled me if not for the #21,000.
Sure, but I'd rather go with trusted buyers only, and that worsens the occasion.
Given that Bisq doesn't use a full reputation system, then that would be difficult. Although nothing stopping you from only accepting cash trades from users you have already done non-cash trades with and have a good local reputation score.
I am doing that all the time, but in best cases I am getting answers they lost all money in crypto investing in some shitcoins crap.
In worst cases they think it's all a scam or they never heard anything about Bitcoin.
In those cases, I just politely inform the merchant I'll take my bitcoin business elsewhere, and if they would like to secure my business in the future then to consider accepting bitcoin. Don't need to be pushy about it - just let them know a demand exists and move on.
Or face-to-face, of course.
Bad idea. Easy to fake and difficult to verify for the average person.