Mighty was conceived at a really dark time in Mac laptop performance.
The combination of Intel Mac Laptops that had horrible thermal characteristics, browsers that didn’t do anything to throttle background tabs, bloated websites and limited memory created a perfect storm of awful performance that Mighty could address.
Almost all of that isn’t true anymore (besides the bloated websites which browsers manage better), which decimated the potential Mighty market (people willing to spend hundreds a year on a fast browser).