Hacker News Reader

At least for the USB-A versions, the flexing is almost by design. Since it doesn't have the full housing around the USB-A connector, it tends to have a bit of motion in the port. Its not even that the device is flexing, its pushing on the pins on the USB port more or less as it moves. I can't speak for the USB-C version, as I don't have one and I don't suppose it has that same thing going on.

It's more likely to break your usb port if it's like the standard yubikey

I've had one of the very first Yubikeys on my keychain for about 10 years now, which is a very rough place to be, and it still works fine.

I think that's just on first enrollment, you likely can use much lighter touch in normal day to day use.