A digital picket line would apply to journalists working from home, not consumers. During the Miner's Strike, I don't remember anyone stopped using coal in solidarity.
I think the main difference between miners strikes and this is that if you used coal for heating/cooking you didn't have a lot of alternative options other than just not heating your home.
Not really a viable option.
Still, I was just more curious whether this was a posting for awareness that it was happening or if "don't cross the picket line" was shared for solidarity.