She's a goddess of secrets who builds dungeons, and is the mother of cats.
At some point in her life there will be a giant pit of pure sadism that needs to get filled when she builds these temples and vaults to protect another god's precious artifacts for their soon to be heroes.
I mean seriously, wouldn't you like to have a feline shaped god that can not speak normally, try to gesture out that it desires mushrooms whos spores when breathed in causes the body to suffer necrosis. Where the very flesh falls off of their bones.
Definitely keep the wrong people out of there. Fuck their shit up real good.
Maybe the two can do business after all. Though there's gotta be an agreement of privacy on Sombra's part, because Yig will slay any stray cat he sees in his Workshop.