I think it's a good idea to have mining through VR, may create a game through which people will do certain tasks and play it as a game as well as mine.
They could have some promotion where they hide coin around at a certain point
I don't think that kind of mining.
They will use miners cpu-gpu power to run the system. So it will be a similar experience for miners.
if they do, won't that affect the performance of the platform and the PC? won't that impact the experience?
The miners are not the ones using the platform, but providing the computational power that is needed for the actual users. Like with Bitcoin, the miners are of course compensated for this.