If they are already monthly/yearly license with DRM and very tight cloud integration it really doesn't matter to them that code itself is not copyrighted. Lock in will be the whole system. Someone might try to make worse replacement for cloud but I doubt that will work well enough for most users.
Once you stop selling boxed licenses piracy somewhat goes away and thus risk of not being able to prosecute it.
No, but what's the alternative theory?
Only the parts that have human authored segments are copywritable.
That percentage shrinks every day. Someday soon it will be small enough to eliminate most of their copyright protections.
They are, presumably, competant enough to know this.
If they are already monthly/yearly license with DRM and very tight cloud integration it really doesn't matter to them that code itself is not copyrighted. Lock in will be the whole system. Someone might try to make worse replacement for cloud but I doubt that will work well enough for most users.
Once you stop selling boxed licenses piracy somewhat goes away and thus risk of not being able to prosecute it.