Lets get something out the way early on... Ubisoft are destroying the industry, with shoddy games, shoddy business practices, and they're frequently complaining about things which they blame the gamer for, yet ignore that they're they a significant reason for the gamers actions.
That said, theres a lot of people frothing at the mouth and getting their knickers in a twist because its fun and easy to hate on Ubisoft.
They're not revoking keys because they've realised they've come from someone selling them at £20 and they want you to buy them at £50 direct or £40 from an approved selling. For starters, how the F are ubisoft supposed to know how much you paid for a game?? They cant look at a key and say oooh, that was Oleg in Minsk, how dare he sell a go to a store and buy game for £10 and then sell the key to someone for £20.
Best case scenario is Ubisoft know who they sent that key to, so Games-R-US.ru bought that key, someone in the UK/US etc activated it, but its not illegal.
Whats most likely happening is that people are buying copies of the game, with stolen CC details, or phished data, and then selling them as if they're legitimate keys.
The seller lists them on a key selling site, which... low and behold, is exactly what G2A and Kinguin are, and unsuspecting customers buy them, believing they're legit.
Eventually, its discovered the keys were acquired illegally, the real key owners then report the theft/fraud, and Ubisoft are shutting them down, because those keys, however they've been obtained, knowingly or not, were part of an illegal chain.
You wont get Ubisoft saying 'oh well, let em have it for free' cos someone has originally paid for those keys and got nothing because someone else intercepted them and sold them.
Also, the quote bringing pewdiepie into this mess is an absolute joke! Its more moronic nonsense.
PewDiePie isnt the face of G2A, just like JackFrags and a ton of others arent. They're simply affiliates, they spam their content with codes, viewers save a little on the purchases, and they make a little $$ in exchange.
They're not the ones selling anyone a game, Jack doesnt have a storefront, he doesnt sell you Far Cry 4 or The Crew, he simply tries to get you to buy from a site which allows people to sell keys.
This thread is full of the tin-hat brigade and people foaming at the mouth screaming conspiracies. You swap 'Assassins Creed key' for anything else, a Ford Focus, an iPhone, jewellery etc. Then swap G2A or Kinguin with [well known auction site], and theres not a single person in here who'd be arguing that its about how much was paid, that you should be entitled to keep illegally obtained goods (even with no wrong-doing). But cos its a video game, by a hate (rightly so) publisher, then its acceptable.
Also, FTR, i dont agree on the early statement that 'if you buy from these cheap sites, you accept the risk [that its stolen]'. What rubbish! Being cheap != stolen. There are plenty of legit sellers on these sites, but theres bound to be some looking to take advantage. If they havent got lots of reputation and the store doesnt offer insurance (not that you need to take it) then it should set alarm bells, rightly or wrongly.
Ive bought a handful of games from Kinguin, reputable sellers, and ive also gone direct to overseas stores like the Nuu one in Brazil (not sure about naming names, although we've listed G2A and Kinguin so...) and they've been fine. Why? Because they're legitimate keys, legally obtained, and sold at a price that happens to be considerably cheaper, because they've legally obtained them at cheaper prices.