I happen to like messing around and trying to find exploits. Sometimes this also involves manually editing values of memory addresses.
The funny thing is, if you have unlimited currency, it becomes really easy to notice if a game is blatantly lying about drop chances.
As an example of something I noticed today.
With a pity at 80 pulls and a 3% legendary (and 1% "Mythic" pull rate), I didn't get a single legendary after 560 pulls.
Every single mythic pull also happened to be what should have been a legendary pity. Essentially, my guess is that none of the 3 shown legendary characters are unlockable at the current stage of the game so they are essentially forced to offer the mythic. (I also never got the mythic before pity so I'm guessing it's also not possible to be pulled)
I would have done more pulls, but they take an absurd amount of time and it's much easier to just edit values.