Often reviews work like: "If you give us a good review, you can keep it"...
The only mic manufacturers I've seen do that are rebranders like Tonor and Neewer and other Chinese companies. I have seen iSK send somebody their cheaper mics like the dynamic and Little Gem and CM-20, though I don't know if they were on a "good review equals free mic" basis.
I know companies like the Chinese rebranders give free mics for good reviews. Synco offers people a big discount or a free video mic ($50 or so value" for giving their Mic D2 shotgun mic 5 stars on Amazon, I've seen the other Chinese companies on Amazon offer a free product for a 5 star review, though sometimes they want a 5 star one just for sending you the product to review with seemingly no promise of keeping the mic.
I'd be surprised if Golden Age does it, but there's got to be some incentive to give such an overpriced copy a good review. But for anybody actually interested in a C800G clone of questionable accuracy, they should probably just get the one from Advanced Audio. I doubt it sounds the same as a C800G, but it's probably close enough, and I doubt this one is any closer.
I'm surprised at the amount of good reviews I've seen of a couple boutique North American manufacturers when the mics in question are noticeably different from the ones their based on. I won't name name's, but how is it possible to make$200+ capsules that sound worse than Chinese capsules costing $30-50, while also seemingly having worse QC for the price? There's no way people giving said mics good reviews haven't been bought off.
Though if I were offered a $900+ microphone for free, it's hard to say I wouldn't give it a good review. Though I'd rather be paid off in cash than mediocre microphones. I'd still talk sh*t about the microphone under a different name though if I really didn't like it.