They either want monopoly, or they want to make money off the technology. I personally don't mind for as long as the patent is filed in good faith, meaning they're actually trying to devise a way to speed things up using the method they described. Intellectual property is still property, after all, and they should be able to do what they want with it.
It's nothing really interesting in the first place, especially because of the fact that with Lightning Network, transactions are settled off-chain and instantly already. I can't think of anything that can beat off-chain transactions in any shape or form. On top of that, PayPal could even just use its own global centralized ecosystem to allow user and merchant to settle transactions instantly. At the end of the day, PayPal is just looking to exploit crypto's increasing popularity to boost their fee income. Never will they just do something without any financial motivation behind it, especially so with greedy share holders looking for an increase in operational results. PayPal doesn't give one single damn about crypto transaction times....