I suspect JetBrains will never limit this. I've yet to recall anything in the past where they have done this even when they have a similar offering.
In fact, their own AI extension appears to be pluggable in and of itself. I think they see the value in being easy to adapt different AI solutions to rather than trying to only provide their own.
JetBrain's main business model depends on buying the editor, and if users still see the overall editor better, any AI plugin support will likely just increase the sales.
In fact, their own AI extension appears to be pluggable in and of itself. I think they see the value in being easy to adapt different AI solutions to rather than trying to only provide their own.