It probably comes down to how many have actually added their cards to GPay and Apple pay, best to experiment and check if adding paypal improves your conversions
Hyperswitch is free to use for the first 10k transactions of the month. After that it costs $0.04 per transaction. It is a payment switch that comes pre integrated with major processors. So as a merchant your business relationship with processors like Stripe or Adyen remains the same
(I'm affiliated with this product)