Many people unfortunately have their cameras routing thru their wifi router and it causes problems. Countless examples of folks coming here with issues and were doing just that and cleared up after they removed that data stream out of the router. You would be surprised how many let their router assign an IP address to their cameras, which then forces it to route it and makes the problem even worse.
Because these cameras do not buffer, if the router gets "overloaded" and has a lost packet, it has to resend. It can bring the whole network down if trying to send cameras through a wifi router. At the very least it can slow down your entire system. Consumer grade routers are simply not designed for the 24/7 constant demand, never taking a break, cameras. This will happen even with hard-wired cameras going thru the router.
With a streaming device like a Netflix, because of the buffering, the router is taking "breaks" as it routes and deals with other devices on the system and then comes back to the Netflix stream and loads up a bit of that and then goes and does other things.
These cameras provide NON-STOP data streaming and as such can provide a constant load that some of the routers will have trouble with.
On my isolated NIC, my cameras are streaming between 280Mbps to 350Mbps depending on motion. This is full-on, never stopping to take a breath. Even if someone has a gigabit router, a 3rd of non-buffering 24/7 data will impact its speed.