Chapo Trap House has exactly one pledge level at $5+, which means this change would have probably benefited them financially. They'd be unlikely to lose many patrons upset about having to pay $5.50 a month instead of $5, and they'd be getting 3-5% more from each pledge due to no longer having to pay transaction fees on their side.
You'd be surprised how many people would be upset at $5.50. Especially since that $0.50 is going to be multiplied by the number of creators a single patron supports.
For me it was enough to put "just pay an annual lump sum to my favorite creators and drop the rest" on my TODO list; I'm glad Patreon came to their senses.