I thought all of the cellphones used something like this. At one point they were easy to "fix" to where the pink dye could be hidden. I know on my old-skool RAZR I was able to take a hole punch, punch out a new white disc and glue it to the old moisture indicator. Thus hiding the fact that I dropped it in the tub when giving my son a bath. (Never put a phone in your shirt pocket!)
The mfgs got smarter and now they have red plus signs on a field of white, and are more like a piece of tape.
I recall reading a thread here on AF where someone had an issue with being denied warranty work because the indicator (allegedly) gave a false indication of moisture. The belief was that it was due to humidity but the user got nowhere with Verizon.
"A free American means just this: individual freedom for all, rich or poor, or else this system of government we call democracy is only an expedient to enslave man to the machine and make him like it.” - Frank Lloyd Wright