Attempting to summon a glitch user is virtually indistinguishable from summoning an actual entity. The thing is glitch rituals are kind of so stupid in universe to pull off that no one would willingly do them in order. Like who's going to believe that if you bike fast enough in Jubilife you'll just end up in the void. This is all in reference of how glitches are like in pokemon games. Most Rumors operate on demon logic, so like, summoning circles, sacrifices, blood, whatever.

Glitch Users are a small amount in the world of rumors. That's pretty established. There's a bit of an "infection" thing going on whenever anyone overuses their powers to the point they start showing weird traits. Ketsuban shows off the most because he tends to abuse his power to do thinks ranging from harmless weird pranks to literal crimes. Eventually the guy figures out how to not make clones that want to kill him (Wisteria was not one of those clones, bro was born a hater.)

There are people who go into the void who also end up with the same infection types. Basically, they're just marked as "disposable." Occasionally the mark wears off but for the most part anyone who isn't a normal part of the world will be hunted down. I like to think that in universe Cinnabar island is cursed because when they were experimenting on Mew before gen 1's start they accidentally awakened Missingno.

Another thing about rumors is that if you start making fun of them that they lose their varied sets of powers or if people can't get the story straight it causes problems.

This is what is referred to as "the agenda."

If you make enough fun of the terrifying thing and believe it then they get weak, so if you're either A. a skeptic or B. ignorant, you can actually defeat a weaker rumor if they need to rely on psychological things. C. Is the option in which another person's agenda is put against the first and they can counter each other.

The agenda is just another version of slander if the reader is heavily biased and ignores context to make a character look bad or look good and then they go online to make fun of the character.

It’s just another reading comprehension joke. But I think it would be hilarious if characters were actually affected by if the readers in universe didn’t like them or not. Like how on tumblr people used to believe that there was a secret season of Sherlock and another show because their endings were so bad that the site basically maniuplated itsef into believing it was real.

The amount of mystery they have let's them be stronger because like, the more something is explained or blatantly told about then the less you have to fear.
The thing you fear the most is the unknown, after all. Or like, a giant yelling screaming monster. I'd be afraid of that for about 15 minutes unless I can respawn in which case eventually I'd just be annoyed. Get new material.