I guess I don’t see what the incentive would be for this, or even what it realistically means in this case.
Do you mean like relicensing the backend and frontend with a closed source license? I don’t see what the incentive would be for that unless they wanted lemmyml to be the only instance in existence (which runs counter to it’s raison d’etre) and to make secret/proprietary/commercial extensions to it that are difficult to develop in the open.
Or I guess unless they wanted to start charging instance admins for the honor and pleasure of running their software, which at least right now would be the quickest way to ensure nobody runs their software.
Broadly speaking it sounds a bit like Antitrust https://en.m.wikipedia.org/wiki/Antitrust_(film)
But I haven’t seen it in quite a while so I’m not sure how well specifics line up.