As far as I know there are only two types of bubble gum in WoW.
One comes from the Ogre Pinata, a TCG Item.
The other one comes from Island Expeditions and can only be used in Island Expeditions.
Now why is it bad?
Because bubble gum is something that is supposed to be readily available for all throughout the world. One item is very rare, the other is limited to content nobody does.
Increase World of Warcraft realism! Make bubble gum readily available to all! In many flavors!
Ugh I hate gum. What a mess it makes of city streets.
I don’t want Oribos to get covered in gum.
I hate to burst your bubble, but I don’t think that idea would stick. Not trying to chew you out though, since it’s a good idea. It blows that Blizzard doesn’t do fun things anymore.
Laughs in TBC from a box of cards I got at walmart back forever ago which had this.
I feel sorry for all the Taurens and Draenei who end up getting gum stuck between their hooves 
They had it coming.
Sounds like a fun consumable in Darkmoon Faire.
It’s illegal to do this in Singapore.
Is it illegal to do this whilst playing WoW from Singapore?
Edit: Actually never mind, I suspect it’s illegal to be a stealthy rogue murder-hobo in Singapore too lol
Wait…
They got Tauren and Draenei in Singapore?
Gum is banned there outside of nicorette and other medicinal gum.
What in the name of cold hard logic happened to allow that to be created?
Trolls will get gum stuck on their feet and between toes.
That’s the only TCG thing I ever got. It’s pretty fun.
I wish I had it. I don’t care for rarity or prestige, I just wanted my toons to chew bubblegum 
Since it’s a TCG thing I am inclined to believe that they would only stick to adding it in for some dungeon/scenario.
Swing by Frostmaine, I got you.
The guy who built the city made the law. Though it was unkempt or something.
Also:
The ban remains one of the best-known aspects of life in Singapore, along with the country’s laws against litter, graffiti, jaywalking, spitting, expelling “mucus from the nose” and urinating anywhere but in a toilet. (If it’s a public toilet, you are legally required to flush it.)
I’m all out of bubble gum. I’m just here to kick some butt! 
A bubblegum crisis, you might say.