Am I wrong?

You are not Merryprankster and you have been reported.

Reported...for being the Merryprankster21 account?
Lol

And then CharlesHobby1 - who is not the original CharlesHobby - complained about somebody doing the same.

I am the same CharlesHobby. I resigned from Imgflip and then returned and the system tacked a '1' on my name. What fun it would be if everyone stole names on this system. I bet no leftist would be bothered about it.

User just created two memes. That's it. That's literally the entirety of their activity on the site.

A Merry Prankster is actually a thing, or was,. They were Hippies before Hippies were Hippies. You can look it up like I did.
Yes, Virginia, it is entirely within the realm of possibility that there are other people old enough to have heard of or cared enough to name themselves after them.

Try this for funzies, from Discord to Twitter, I wasn't able to use the plain old name Modda. In Twitter, I was actually Modda20. I forgot how many digits were added to my discord, as I changed it after. There's even a Modda. - yes, Modda + "." - on this very site.