Can you still play BO1 and MW2 online?

I've been getting a few classic COD videos in my YouTube Shorts, like killstreaks on Jungle or Terminal, even a Gun Game match in Firing Range. I have BO1 but I heard that the game is crawling with hackers who can dox and DoS you if you get into a match with them. I'm curious if there's like protected servers or mods that let you play with people like the good old days. Any info is appreciated.