Quoted from Frax:

.......Orange Box? Really? That game is THIRTEEN YEARS OLD. It costs money to run servers. You can't possibly expect them to keep console game servers up for that long. If you want to play that and TF2, get a PC. It's not like either are hard games in terms of computing power requirements. TF2 still has a fairly large community on PC, but I seriously doubt anyone at all is playing Half-Life 2 deathmatch.....it was more barren than a 105 year old woman's uterus 7 or 8 years ago...
Nobody is playing them because the servers have been removed, nobody is playing these consoles online anymore, or both.

Quoted from Frax:

Funny, I've gone the opposite direction....because of pinball. Console and PC is so laughably cheap in comparison, doesn't require constant babying and repairs, and if I want to play against someone, I don't have to find the time and money to go to a location.
I'd still rather play Overwatch. TF2 always ends up with me playing heavy or engineer because I have a team full of douchebags that don't ever defend the base, and short of an Ubercharged medic and heavy rolling in, I can stop just about anyone in 2Fort4 by my damn self as a heavy. It's just boring as hell to do.
Literally the only reason I would play TF2 is to hope I got another Unusual hat I could stick on steam marketplace for 100 bucks.