Core is the full version. The only thing missing is the mac and win11 layouts and the preinstalled programs, which can be downloaded and installed for free. The purpose of paying is for paid support and to support the project.
You don't buy a new car and expect the next years version for free, do you?
Windows offers the free upgrades because you end up paying for storage or services used with the operating system. They are more focused on services now than os. That's also why it's half baked and buggy. If you believe you are owed this, maybe you should stick with windows.


