You suggest Mr. Angus is spineless for not having a Mastodon account and I take issue with that...
He has stepped up to call for US boycotts and to organize the Canadian resistance. In fact I'd call him one of the few Canadians who have shown their spine and used their position to bring the idea of a resistance movement to the masses. He's amplified his message now collaborating with Meidas Touch Network.
It's true that Substack isn't the best platform of this type, there are better alternatives, and Nazis and many nasty people use it and profit from it. However, quibbling over this platform Mr. Angus uses in a way that dismisses his works frankly is quite irritating to me. Excuse me for venting frustration at you. Link to Mr. Angus' Youtube Channel as an alternative