Not sure which you are referring to, but they’ve both been around as creators on YouTube forever. They are both still actively making content. I’m not sure what memes you’re seeing, but maybe you’re just coming across communities with people that grew up watching this stuff more now. AVGN started in 2004 and Nostalgia Critic in 2007 so there’s a long history out there.
I don’t know what these would really be alternatives to, but I impatiently await every new game from Daniel Mullins Games. Inscryption was a fantastic deck builder and I more than got my monies worth out of it. I also follow Stranga Games pretty closely. Very small developer makes story focused retro style adventure games. No combat at all generally. So if you like a casual experience and that style of game, it might be something to look into.