@Shoko Strang - My best guess would be that Miro would treat this change the same way they would if the user was being deleted from the team and should prompt you who should be the new owner of their content (boards, projects, and templates). I say just for it and see what happens  (and I say that with confidence that things won’t completely break for you...)

@Shoko Strang - I was still curious about this and found the following note on the License management on FLP subscriptions Help Center article:

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My interruption of this is that the user will remain the owner of the board, and will be able to modify the share settings, but they can only view or comment on the board.

The Enterprise and Business Plans are the only ones that I don't have any hands-on experience with. I would curious to know what happens.