Ubisoft is punishing PC Gamers after years of support. Their new DRM solution requires you to be online every single second you're playing (even SinglePlayer) otherwise you're kicked out. This is the latest in a long line of insults where piracy is the scapegoat when publishers are actually trying to stamp out second-hand sales.
Please follow this link for a way to fight back.
And if you feel as strongly as I do, don't buy any more Ubisoft games on ANY platform until they stop treating their best customers as criminals.