I bought in Croatia 15 Ritek CD-Rs (street price 2KN, this is 0.25 EUR), they were blank on the top (unbranded) and on the bottom green.
I look at one, and it had a booble. Almost every third CD-R caused track following errors and even perfect copies caused a jitter noise in my DiscMan, where others didn’t.
I checked the ATIP and it said: Ritek
So it was clear. Maybe Ritek manufacturs also good media, but this was clearly very bad quality media intended for a market with rampant piracy where there is CD-R shortage.