From The OHF:
Because Non-Sanctioned Leagues operate outside of our structure, the Ontario Hockey Federation has no way of ensuring that those Leagues implement many of the fundamental safeguards inherent in Hockey Canada programs. As a result, those Leagues may not be using the same Playing Rules that Hockey Canada has implemented to protect player safety and may not provide adequate insurance for their participants. We also cannot ensure that the quality of play in these Leagues matches the level advertised.
The Ontario Hockey Federation respects the right of every individual to choose between participating in a Hockey Canada sanctioned league or a Non-Sanctioned League at the beginning of each hockey season. Every individual who makes the choice to Participate in a Non-Sanctioned League, however, must understand the ramifications of that choice, as described in greater detail in Section III of this policy.
The cutoff for playing in non-sanctioned leagues is September 30, 2020. If a player participates in a non sanctioned league after the cut off they will lose all privileges with the Ontario Hockey Federation for the remainder of that season.
Full Details OHF Non Sanctioned Leagues