You really don’t see the parallels between this statement and “anyone can become a millionaire”?
There’s a chance you could stumble onto a point if Lemmy was profit-driven.
Not everyone has the opportunity or the skillset to “do what they want” with the source code. I’m not a coder. How can I do whatever I want? I’m beholden to the structures that other people build.
You don’t need to be in order to be able to download the source code. Skills are not ownership.