Medieval and early Renaissance Florence had quite a growing banking and trading economy, which came in handy as it generated a lot of wealth to allow a plutocracy to happen. Albeit temporarily as soon as the Medici eventually got ennobled and had Florence and the entirety of Tuscany submit themselves to the Holy Roman Empire. I won’t be so surprised if there were some people critical of it, even if others depended on it (the early Medici).
Especially the Catholic Church at some point because it considered usury a sin or something and there were some believers/followers who believed in the same or at least similar. Dante Alighieri wrote about such characters in The Divine Comedy though I get the impression from reading those been to hell testimonies that I’m convinced the Divine Comedy’s an early version of these.
(He could probably be a Evangelical by today’s standards in a way.)
Anyways, given Dante’s apparent disinterest in banking it’s parsimonious that by having his later relatives (especially Ginevra) marry into aristocracy his family may’ve dodged a bullet as soon as the Medici ascended from plutocracy to actual nobility in his hometown. Though that goes to show up how Florence shaped not only Italy but also Europe as the Middle Ages drew to a close.