@ahhhh While this sounds super funny, since your bank account is tied to your identiy, you'd just be a nice redditor that keeps the money and returns it to the sender in a reasonable time
@toesockshoe Personally in the interest of keeping life simple I'd just use whoever I have my main account with even if it's not the best interest rate. For 10k shopping for half-percent differences in interest rates is a bit of a microoptimisation, there's surely more money than that available to be optimised elsewhere. (I'm not saying 10k isn't a good chunk of money of course, but compared to the 6/7 figure sums people are dealing with for e.g. retirement or real estate later in life it's a microoptimisation).
If I was looking for a new savings account, I'd also look at changing my entire banking package in general.
@toesockshoe for high-interest savings accounts you'll want to go to the regional, cantonal or raiffeisen banks generally. the big ones are big because they keep the lion's-share for themselves
@toesockshoe credit suisse is a fine bank to put it in, first it was merged with ubs so youre essentially giving it to them, but even if not, credit suisse was still a good bank, just bad publicity ruined the stock.