There is no mention of Android, iOS, or windows in any regards.Have you checked the offer T&C to see if it is even applicable on ios devices?
Only the master/primary key holder can renew acc on same key every year so you will have to spend from your pocket first anyway. You can revoke the premium privilege of any invited accs from primary acc dashboard so if someone doesn't pay then you can just revoke their premium status & invite someone else willing to pay or simply use for yourself.Here is the scenario I am confused about –
I buy 365 family sharing plan for whatever price at the time. I share with 5 people who pay for one year. then come next year one or two decide nah we are not going to continue, then what? I will have to pay theirs from my pocket right?