Thanks a lot, Sony. No really, thanks.
It's great that you guys [Sony] have been ignoring Syphon ever since LS came out and underperformed in 2007, but now you decide to shut down the last titles that had online in the series. Yeah, the games got swamped with hackers which is why I assume so many people stopped playing, but still.
Now there's nothing. Unless people wanna play Syphon 2 or 3 online over ePSXe (PS1 emulator), there's no longer any way to play Syphon online with others.
It was great while it lasted.
R.I.P. Syphon Filter
1999-2012

My observation has purpose, hence I am here.