MS just has a different approach than Sony when it comes to F2P games. It's rumored MS has signed exclusivity deals for LoL and Hawken so it looks like they're only interested in hand picking exclusive games they think will do really well in their platform.
Sony on the other hand is going out to developers and telling them "
hey, what do you think of bringing it over to PlayStation 4?" without attaching any strings. AFAIK Blacklight, Warthunder, and Warframe are being self published. None of those developers had to sign exclusivity deals or seek a publisher out to get the game published on the console. BR is also using
Sony PubFund (advance against royalties) to fund the development of the port. The other 3 announced F2P games are first party.