Are you talking about ANY security camera, or just ones that monitor living spaces?
I have a security camera in my front hall, so I take exception to being told I don't belong on Airbnb. I think there are good reasons to have one.
As a new host, I'd read so many horror stories of extra guests, theft, party-going-busloads of people...it was of great concern to me - and having a camera resolved a lot of those worries. Not that nothing bad will ever happen, but it seems likely I'd find out about an issue before it develops into a worst case scenario.
I'm more flexible with guests because of it - more comfortable allowing late-night (after I've gone to bed) or self-checkins because I can see that - yep - that's the person who reserved the room and they have the # of people they said they'd have.
And that camera isn't just directed at guests; several cleaning and service people have access to my home. While I think they're all good people, it's difficult to always know. If something ever went missing from my guests' rooms, I'd have a clue about who was in the house.
That said, this is a camera in a shared hallway, not a living room or bedroom. It's disclosed in my house description and I haven't had any complaints from guests.
I don't think a (well-placed) security camera takes away from my ability to provide an excellent host experience.
And I'm not leaving 😉