The 11 months old version is opensourcenand nice. The current version is for customers only. That is their current business strategy to fulfill nthe KDEnagreement, while trying to survive as business, which seems to be tough for them.
The current version (6.3, just released) is free and open source.
You must be confused with the LTS which is the commercialy supported version. And yes, if you want a commercially supported version, you have to pay. Isn't that normal?
