I think OP is correct, I'm not sure a judge would say that the "market" here is the entire set of cloud offerings. If the market is CDN, Cloudflare is the current market leader.

I think this is generally how things are seen. For example, in the Apple vs Epic lawsuit, the judge said the market was "mobile gaming", and that in that space Apple was not a monopoly.

Amazon total revenue adds up, but in each of the cloud categories they operate in, are they the leader?