Deterioration of public transport is political. NIMBY's don't want public transport in their backyard, out of fear that it might bring in "undesirable" folk. Uber and Lyft have zilch to do with this.

If anything, these services make public transport more effective by solving the "last mile" problem for its users and thus obviating the need for a privately-owned car.

Airbnb is contributing to a housing crisis? You know the way out of that "crisis": Build more housing. Or more hotels, since the scarcity of hotel services is clearly what's driving Airbnb use in the first place.