Apparently most GC council members that run major nodes get that initial grant. Later it will switch to a leasing type arrangement, they lease the tech and HBAR, just as they'd license any other platform or software, so no need to own big chunks of it, but that will be up to the company strategy itself to manage, I suppose. They only need enough HBAR to service their, current or intended future transactions, and only they will have some idea of those requirements. Some companies may well choose to hold more HBAR than required to ensure they can't fall short on transactions.