Does Waze actually have all the speed cameras - especially on larger roads?

I drove down to Exeter last week and when using Waze for navigation, does anyone else also think a lot of cameras could be missed? For example on the M4 from the roadworks in Reading up to Bristol there were no speed cameras according to Waze? That's despite there being plenty of signs saying 'speed cameras'. And on the way back on the A303 there were also a few times I went over the camera lines on the road but Waze didn't warn me. Is Waze still accurate or are the cameras no longer marked? For example I know going into Bracknell there are lines over the road on the A322 but not marked on Waze