The ad serving companies (Google) don’t care about what happens after the click (yet). As far as I’m aware no “handshake” process exists that would allow an advertiser to communicate with the as server and validate a click (such a process could be abused).

Most likely the advertiser would be using some form of client side analytics, so the click wouldn’t show up in their statistics, meaning the advertiser would see a huge discrepancy between the clicks they saw in the campaign and the clicks the ad server reports.

I’m not sure what you mean by “open source compatible”. Do you mean the camera itself can have open source firmware installed, or that it’s compatible with open source NVR software such as Shinobi or ZoneMinder?

If the former, I know some of the Wyze cameras have that option. Like OpenMiko. There’s all OpenIPC, which does have a list of supported devices.

If the latter, any camera with RTSP and some sort of API to expose PTZ controls would do. My personal recommendation would be Axis, which makes solid cameras.