Comment by themoonisachees

To expand on that:

Comcast would much rather sell a dedicated fiber to a business with capital and guarantees.

Selling to the individual consumer doesn't make a lot of sense business-wise, because of the deployment costs and continued support costs.

Comcast is also abusing their status as oligopoly to gouge costumers financially and qos-wise, but if they're selling to a business that buys large quantities and has staff who's job it is to handle network problems, they actually like that (right up until that business threatens to compete with them in areas where said oligopoly is in place, of course)