Would be good if someone posted the video with he saying why he changed side.
Probably not hard to find. I'll just look at the videos where he stops bashing Sony and starts bashing Microsoft. I imagine it's a money thing. Sony fans far outnumber Xbox fans and, though there's money/views to be made by being contrarian, there's probably more money to be made by going with what's popular. People eventually get bored watching content from someone they disagree with.
He should have ditched the name "crapgamer", though. Hard to take him seriously with that monniker.