Nothing yet, as far as I know. In the future we plan to use that association for content migration, e.g. bringing PF1 or other games to HLO (please note, we haven't announced any timeframe for doing that at this time).
It may have other functionality later on to, but I'm not recalling anything else. At any rate, I believe it's safe to hold off on doing so if you want to be sure.
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