The same channel also had a video about shady FX exchange places. Not sure if it is still up as they had to take down and remake a bunch of content, this video included.

Regardless I saw the DCC and high CZK tricks on the Euronet ATM in the airport and was able to avoid both, thanks to the earlier version of this video. The unfamiliarity with CZK denominations is probably why the scam works. The high amount scam is not as prevalent in other countries that have Euronet ATMs though.

And no, I did not have to pay the ATM fee since it was reimbursed by Schwab.