The most serious breaches of privacy have been made by governments with backdoors and not some script kiddies... Either way, nothing will be taken away from you if another app store is available. Just continue using the Apple app store as you did before. You're taking away the choice of others just because you feel yours is best.
Apple has the majority of the mobile OS market in the US, and more than 3x the App Store revenue that the Play Store has.
But that doesn't matter when it comes to antitrust laws[1]:
> Courts do not require a literal monopoly before applying rules for single firm conduct; that term is used as shorthand for a firm with significant and durable market power — that is, the long term ability to raise price or exclude competitors. That is how that term is used here: a "monopolist" is a firm with significant and durable market power.
