I would say the potential for misuse, while definitely present, is outweighed by the potential benefits.

A creep watching you from their basement is less likely to act on their dangerous impulses.

An overcrowded bar, poses a lot of risks in itself and the ability to determine how crowded the bar is without having to be physically present can mitigate your exposure to those risks.

In a crowded bar you have a higher risk of being drugged or assaulted because security and staff will likely be distracted or simply unable to notice and intervene. Also, in the event of an emergency that requires you to be able exit quickly, such as a fire or earthquake not only will it be much more difficult to leave it’s also more likely that people will panic and exasperate the problem.

Is a camera with a public live feed the best way to achieve that? No, probably not. But it’s simple, cheap, and gets the job done.

A bar is also a public venue. In a public place you have absolutely no reasonable expectation of privacy. So, while in most circumstances it’s unreasonable to expect that you’re being recorded, it’s equally unreasonable to expect that you’re not.