The simple (possibly too simple) answer to this question is that, like any service offering established in the world, one could choose not to purchase or operate or interact with infrastructure he owns.
I acknowledge this is a possibly naive outlook, but similar to how one can choose to buy from a local market vs. whole foods, one can choose to operate (and interact with) urbit infrastructure they recognize as being true to their beliefs/ideals.
This is obviously hard to do real due diligence on, but I do believe it will be possible.
While it goes without saying that -some- subset of folks out there will be fine and actively pursue purchasing network infrastructure/nodes from curtis, and he will inevitably profit off this subset, one of the primary points of urbit’s existence is that folks who don’t wish to interact with nodes involved in that sphere can choose to do so incredibly easily.