I also used a Find 7, which I've still got as a spare phone. But the Oppo forum that I was a member of as well, that's effectively been shut-down, all threads and posts deleted, and now is only for Vietnam, Indonesia and Taiwan. Oppo Style their official online retailer for western markets, like North America and Europe, that closed earlier this year.
Not just Google, I think Oppo changed direction themselves. All their current devices like the R series are very locked down, root difficult or impossible, and no custom ROM support from Oppo at all. Oppo now is all about their own Color OS.
Not sure the situation with OP, now if they still actively support, rooting and custom development for their products? They stopped with Cyanogen a long time ago, and their Oxygen OS(Hydrogen OS in China) was developed in-house.