Google isn't trying to sell you their internal systems. This is a bullshit AI hype bubble advert masquerading as an academic paper. Bet you 10 bucks it doesn't get through peer review (or isn't even submitted for peer review).
They sometimes are.
If you have an issue with the methodology of paper then all well and good but "conflict of interest" is pretty weak.
Yes, Google and Microsoft et al regularly publish papers describing Sota performance they sometimes use internally and even sell. I didn't have to think much before wavenet came to mind.
Besides, the best performing models here are all Open AI.