There's no technical logic to gaming latency* being affected by some streaming services and not others, so I'm guessing correlation but not causation.
To get a view on what's happening, I suggest you setup a Broadband Quality Monitor. Let it run for 24 hours to gather sufficient data, and then post a link to a shared graph back here, not a copied image or screenshot. If all that sounds like rocket science, tell your son that this is his problem, and he can do this!
* Latency is how long it takes a signal to make a round trip from your computer to an internet server and back gain (or vice versa). It is measured in thousandths of a second, and is near enough the same as "ping"; Poor latency or ping are referred to as lag.
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