Blockchains by number of nodes/validators

I would claim that would be just as bad if not even worse, as the biggest sin in the marketing of cryptocurrencies is that people create a circular value pump that starts with VC money to subsidize "rewards" for people running nodes and then they claim "we already have hundreds of nodes!!" which causes the value of their token to go up... which then means they have more value to continue providing subsidies. These rewards are paid out using the token, and to run a node--and thereby earn rewards--you have to "lock up" (aka, commit to not selling in the near future) a bunch of the token, which means people like to "reinvest" their rewards (to earn more rewards, which they mentally be model as an APY on their capital) rather than converting it immediately back into another currency.

This causes a massive--and very unsustainable--"pump" in the value of the token, as more people rush to invest in the token so they can get paid rewards by staking it (to set up more nodes and earn more rewards), which is then used to market the product saying "look how many more nodes we have! we keep getting more and more nodes!" causing others to rush to invest in the token to speculate on the value increase, which adds up to the value of the token going up and thereby either the value of the treasury held by the company going up or the value that can be extracted via inflation going up, which can then be used to pay for more rewards.

The ONLY correct metric by which to judge a cryptocurrency project is by the amount of legitimate--not "I am going to subsidize our nodes by acting as a client and using the network a ton randomly to make it look like there is a lot of usage"... which, yes, means this is a difficult metric to correctly measure--traffic, as probably measured by revenue (but maybe "untainted income" or something would work? I have stared at the question some but never managed to figure out what the best exact figure is... which is of course even harder of a problem than valuing a normal stock/company).

To draw an analogy: would you want to decide the value of a restaurant chain by the number of locations they have around the world--or a gig economy company by the number of people providing service--if you knew the company took a billion dollars in VC money and could quite literally just be paying people to set up locations or drive in circles without a single user in sight? You'd want to know how much people were actually willing to pay for the food people are buying or how much they are willing to pay for the rides they are getting, and if that answer were somehow not only $0 but NEGATIVE--as cryptocurrencies often set up unsustainable VC/pump-funded incentives focused on the USER as well!!--you'd hopefully be skeptical of the company.

(But, of course, I use those examples to explicitly include the ilk of Uber or DoorDash, as the question for SOME of these cryptocurrencies is "if we can get enough providers in enough places, only then can we unlock revenue and value". But that is then more of a progress check on their ability to build out their network as opposed to a real understanding of whether their product has any value or not... an ecosystem where you have a ton of supply and almost no actual demand is not an ecosystem which is functioning or one which will be sustainable.)

You can run a thousand nodes virtually from a single pc

At a minimum I would group PoW and PoS coins separately, as the incentives for each category are quite different. This site acknowledges that in a way with separate lists at the top for "nodes" and "validators", but underneath they still have the main list sorted by max(apples, oranges)

Chia currently has 123398 full nodes https://dashboard.chia.net/d/em15uQ47k/peer-info?orgId=1