Nice classification of graph dataset size. I just think that XXL is the wrong size for a 1Tb dataset. Datasets like wikidata, UniProt, omabrowser etc. as a graph are really not XXL when decently funded (i.e. if they could afford the memgraph cloud pricing). I would have shifted them so that medium would be XS and then continue to the 1 trillion edges+nodes to get to the XXL size.
Yeah, size classification is always tricky since the reference point always moves.
If you deal more with large datasets, the spectrum would ideally move to the right for you, as you have described, since you probably need a trillion on that scale.