Look, Bob, I don't have a personal vendetta against you. I do find value in clarifying things that are obscured by pomp and rhetoric. What's more, I don't appreciate muddied conversations, particularly when the motivation for the introduction of such mud is purely self-serving, especially in monetary terms.
It seems obvious to me that Substack assesses your quality as a writer by checking on click-throughs from various sources and I would wager good money that they pay out differently depending on the behavior of the users who follow those links, either algorithmically in realtime or whenever it comes time to renegotiate terms. It's not even 2+2 here, Bob.
PS: morality is more than just "would someone else do it". Don't make me start quoting cliches typically reserved for 5 year olds.
Is free, perhaps. But that could be for many reasons, including that you haven't yet convinced Substack to monetize your offerings. Isn't that how it always is when publishing on platforms you don't own? That you must prove your worth to get the paying gig?