The pledge listed here is more a "word is my bond" social agreement to get folks thinking of a Monero to Monero economy, rather than a financial pledge or investment to me.
I don't have, nor do I plan to collect fiat subscriptions with Substack. At this point in time I'm using Substack more for convenience to test a concept. I'll invest capital into infrastructure if people find what Monero Master is doing helpful enough โบ