While most arguments are just technical gotchas, there’s a fundamental topological difference: in a feudal system you have one lord (apparently, you could generally not move without permission). With the new ”cloud serfs” you maintain multiple relations with different lords. Thus, you currently have more freedom of association- and migration compared to actual serfs, to a meaningful extent.
The system is very recent though, and consolidation of power (often through acquisitions) is already massively common and in every lord’s playbook. If they could, the mega-corps would absolutely want to buy other megacorps. Overall the system looks nothing like the idealized version of ”free markets” as taught in schools.