Could be.
However, with this lock, an user can no longer run testcases even with own previously developped keywords (and ofcourse cannot anymore maintain them or develop new ones)
I assume the logic may be, in the final pipeline, those will run with KRE, which needs a licence anyway.
So, it blocks the development of CustomKeywords by using just the free version, as some small business may do it.
Which makes Katalon just gredy.