First of all, it's definitely a "money grab". I am very surprised they allowed unlicensed controllers in the first place: other consoles used to make more from

First of all, it's definitely a "money grab". I am very surprised they allowed unlicensed controllers in the first place: other consoles used to make more from licensing accessories than from licensing software. I'd imagine they allowed it to sacrifice some profit to attract more customers with cheaper accessories and now they feel that they have enough customers already, very strange move at this point. However, the detection methods you described are very bad engineering. Any statistical method will have two types of errors: false positives and false negatives and you cannot eliminate either. Inevitable false positives will do much more damage to the consumer perception of the platform than any removal of third party controllers could possibly do.