"Welcome Traveler~, before you can proceed and learn about the winds secrets, how about a little test of strength by my little windsprite'' - The thousand winds of time
The reason Venti doesn't seem to have the same stalker problem as Barbara is because he just...teleports away whenever they get too annoying.
It also helps that last time this happened he was hanging out with Venessa, who filed a restraining order for him and, since that is technically a contract, Zhongli found out about it and decided to pay a visit via meteor....
So people are a bit afraid of harassing bards now.
Edit: Shout out to @banterismylovelanguage for reminding me of how random Venti can be, he just shows up in the weirdest places... I wouldn't be surprised if next time me meet him he us just composing a song while on top on Zhongli's head. It's a bug? Nope, it's a wisp.
Thinking about how in Security Breach, either Burntrap dies and Malhare (which is Glitchtrap but with an actually good name) exists within Vanny, or Vanessa is purged of Malhare’s control, but Burntrap still lives on inside that little underground bunker of his, meaning that there is no true ending to the main game that truly gets rid of him and he can easily come back for either the Ruin DLC or in another game.
Yeah, I know some people are probably gonna say something that I don’t know about because of some obtuse piece of trivia that gives an obscure hint that eliminating one will somehow get rid of the other (even though it would make no sense), but I am still sticking by this notion.