not really, the app just wants to show (mostly noob) users that they shouldn't reuse addresses after spending, since then they would be in the future in higher risk

maybe.
the scam is that you are trying to fool people into getting scared with a bullshit idea that their addresses are in danger for an imaginary threat from an inexistent quantum computer.

DarthCoin

You can check the code here https://github.com/j-sokol/btcq that it is not scam, nothing is logged, u can also select your own Esplora endpoint and then nothing will be sent out from your local network.