Unless you are using these during sex I consider a microphone to be 10x more privacy intruding than a camera.

Security cameras afaik usually don't record audio, but all phones can. And they don't even need to be pointed in any specific direction.

Many security cameras have the ability to record audio. Depending on where you are, it might be illegal to use it. All the cams I have purchased have it. That would include ReoLink and a recommended model from the Frigate site.