Got to agree with a few others that the most likely reason behind this is Sony isn't keen on having a partially-competing service on their platform; they'd much prefer anyone paying a free-games sub pay for THEIR free-games sub. In any case, what I'm curious about is what this means for Sony and EA, more specifically whether EA won't be offering their titles on PS+ (whenever the sub, eventually, starts giving out older AAA games on PS4 that is.)
If this service was only being released in North America, I could see both EA and Sony stubbornly holding their ground, waiting for the other to blink first; though Sony does have a lead in the U.S., there's still (an admittedly steadily dwindling) chance of Microsoft turning things around, especially if EA jumps behind them to help push. In the short term, even the long term, EA might be content keeping their stuff out of PS+, in the hope that Sony will eventually cave in and let them host their own service.
But Europe is preeeetty much Sonyland, and keeping their games off PS+ services, particularly the European one, is akin to waving goodbye to a substantial part of the market there. If Sony holds their ground (basically, if Sony continues to outsell the Xbox One and has no reason to backtrack on anything,) I could see EA grudgingly deciding that 'Some money gained from PS+' is better than 'No money gained from a service Sony won't allow on their platform anyway.'
Zanten, Doer Of The Things
Unless He Forgets In Which Case Zanten, Forgetter Of The Things
Or He Procrascinates, In Which Case Zanten, Doer Of The Things Later
Or It Involves Moving Furniture, in Which Case Zanten, F*** You.