While many wifi cards have open driver interfaces they still have closed basebands (the software that actually drives the RF hardware) this is usually done for a combination of intellectual property and regulatory reasons. That is, they get to keep their secrets and the user can't make the radio do something it's not licensed to do.
These devs are aiming to open up the baseband of the ESP32 which allow for all kinds of interesting hacks, and probably all kinds of opportunities to run afoul of your countries laws regard spectrum use.
I do foresee some cases not entirely unlike the Flipper Zero arising from this but still wholeheartedly support it.