PayPal is a widely known platform with a good reputation. It had very successful second quarter, pretty good third, so with holidays season coming I do not see any reason why its earnings would not grow.
PayPal is maybe good transferring money within the US. Fees for international transfers are really ridiculous. I would pick, for example, WorldRemit over PayPal instantly for the latter. Besides, there are more money transferring platforms breathing down PayPal's neck, so I would not be so optimistic.
It's hard to say. Outside USA Paypal is not so recognized as standard transfer system. It has big fees and awkward to use in some cases. It's not competitor to Visa or Mastercard. In the other hand, Paypal is investing in new products and moving forward by integrating into market.