I’ve noticed the same thing, and I think it comes down to this: the Internet is important now.
I started online in the early 90s. The Internet was not important back then. Not much depended on it, there weren’t many people on it, so the folks who were there could fuck around and not worry about it. Jokes are easy and safe when they are low-stakes.
Now, the Internet is extremely high stakes. A huge part of society depends on it. People are just naturally less willing to tolerate jokes in things they depend on. Powerful emotions involving fear and safety and security and power can get invoked, maybe accidentally.
Let’s say you’re driving with some friends and one falls asleep. So as a joke, the driver gives the car a swerve and everyone yells. The friend wakes up in a panic and everyone laughs, hopefully including them, eventually.
Now let’s say you’re flying across the Pacific. You fall asleep, but then wake up as the plane starts to drop and the pilot is yelling over the intercom. But then he straightens out and says, “just kidding folks! Ha ha ha, you should see the looks on your faces.” To many people, that’s not so funny.
Basically the Internet started as a car full of friends and now is a giant airliner with everyone in it. So the “pilots” are held to a higher standard.
Seems to me that there are still communities of jokers on the Internet to be found. They just tend to operate at “joke scale,” which is now a lot smaller than “entire Internet” scale.