I guess this happens to all games. I haven't played any other game for as long as BF2, but I imagine that games like Medal of Honor, Call of Duty etc.. all go through the same cycle of having their online services discontinued because it's no longer viable for the company to host a server for them; BF2 is unique in that it's basically ONLY a multiplayer game and it's mod-ability has kept it viable for people long after it's release.
FH should be fine despite all of this. All the devs and community have done is set up a server for our fans to play online with us. (afaik the login server is hosted by PR Devs tho?) hell one of the big reasons that we have so few players is because of how hard it is to find and install a valid copy of BF2.
PR is different because they're modifying their files so that you don't need BF2 to run it, yet they're still using BF2's intellectual property. So PR could be in the crosshairs for EA's legal staff should they choose to write to them. And that would also cause problems for FH IF the login server is hosted by the PR Team. (I think it is but idk)
But tbh, I don't think EA will come after the PR team in any way. PR is more popular than people think. Squad, Hell Let Loose, Post Scriptum are all games that have publicly acknowledged that PR helped them get to where they are. If DICE is any sort of game studio, they have a very good grasp on the FPS industry and have at least heard about PR.
I don't think it's a matter of PR trying not to be noticed by EA, but more that EA doesn't care what PR are doing. They consider it harmless and won't do anything.
The one thing I wish EA would do is just put these old games on Origin for people to buy and download.
No need for them to provide technical support, no need to host a server for them. Just throw up a download link, make a disclaimer saying that "we no longer support this game etc..." and let people give you money for it.
I just can't wrap my head around the idea that making the old titles available to buy would cost that much for them to do.