It probably sounds like a nitty gritty detail here but who is enforcing the 24 hours and how are they enforcing it?

Because if that "enforcement" is Google then they are still engineering a situation where they hold the keys to the kingdom. They may benevolently let you install what you want, but the sword of damacles will hang over everyone forever, with the darth vader contract in full force ("pray we don't change the deal any further"). If nothing else, it will have a chilling effect. But more than likely, it will attract regulators like moths to a flame to coerce Google into banning their favorite open source apps that they don't like. In other words: it won't solve anything at all, really.