http://www.nvidia.com/object/cloud-gaming-benefits.html
A lot of competitioners is not that bad, but gives a reason to work hard on the project. There are also more then one video streaming service out there, more then one gaming console producer etc. You just need to find the right way and maybe your unique feature.
does nvidia use blockchain technology too?
No, but there also no need for blockchain tech in that kind of service. None of the competitors use the blockchain, but it also doesn't give Playkey an advantage on the market. In the end, it only matters how good the service works.
I can agree here. I don't see that there is an absolute need for the blockchain technology for streaming. It's also probably not the unique feature which will be needed. Probably they just need to be good, in the best place better then everyone else to make this project attractive enough. I still think Playkey is a great project and I really hope it will be a big success, but they need to work hard