Where did you read that? I worked at Patreon from 2018-2021 and per creation was a much smaller group than recurring during that time at least. (Think per creation was even disabled as an option for new sign-ups for a while.)
I'm surprised to hear this, I thought it was the main selling point of Patreon. I have per-creation subscriptions to a few people on Patreon who produce very high-quality stuff very infrequently, and I will probably cancel if they are forced to switch to monthly billing. Their stuff is great, but not so great that I'm willing to sign up for a monthly fee that I forget about and then realize 3 years later that they've stopped making stuff.
I don't follow one-off creators like that, to me the selling point of Patreon was that I could support 20 different creators each with $1-$2/mo, with 4000+ fans in aggregate it supported their lifestyle. And by billing monthly, it meant that the card fees were spread among all the creators so that 50% of the $1 didn't go to the bank/VISA, basically making microtransactions feasible.
They're also killing the once-a-month billing so that use case is also gone. I'm not sure who Patreon is for anymore.
I don't have the source anymore, but it was an article about why Patreon is successful and other similar platforms/systems aren't. The per-creation billing option was described as a way for creators to create on their own schedule without having a moral or business requirement to produce enough content every month to justify a subscription. (The business requirement coming from the problem of one-month paying subscribers getting much more value than the creator can afford to give away at that price.)