Why Are There Villain Bars?

In Episode 1 we saw Crypto Night which is a superhero bar. Then, in Episode 5 we saw The Sardine, a Supervillain bar.

Both had great vibes to them but something stuck out to me...

Why are Supervillain bars even tolerated? They can't be a secret as Robert instantly recognised it by name when Z-Team suggested going there.

With how handily a low tier team like Z-Team wiped out the Sardine, surely more capable heroes could clear these places out, especially before Shroud returned to enhance many of the villains present there.

I enjoyed my time in the Sardine anyway, but it has left me wondering why such places exist despite being public knowledge in a setting featuring prominent super heroes. Do you guys have any good explanations to fill the gaps? 🤔