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Nef
Giffgaff is an MVNO (Mobile Virtual Network Operator) using O2's network. A quick Google gave this link, which I've not read thoroughly and which seems to be US-centric, but it also seems to backup your suspicion that virtualized network customers could be given low priority when there is congestion.
Does Giffgaff do this? No idea.
I'm definitely not an expert so this might be all wrong. I've used Giffgaff for years and it's generally been the right balance of adequate and cheap for me.
https://www.tomsguide.com/reference/mvnos-what-are-they-and-what-are-the-best-options