Even if they aren’t lying and have the magical ability to determine the exact number of installs, some asshole is going to create a bot net which spams unique installs for developers they don’t like, skyrocketing the number of “installs” and therefore the cost to do business.
Not really sure what response you’re looking for here. Perhaps the same one as going into any community and saying “I’m so tired of hearing about [major thing that happened recently related to the community].”
“God damn I’m so tired of hearing about the Super Bowl, it’s been a freaking week can y’all just get over it?”