Whether there is a power imbalance between customer and provider is dependent on how competitive the market is. When providers have market power, consumers can form associations to collectively bargain down providers' prices.

Is there an enshittification example without IP?
Enshittification usually happens with monopolistic firms not competitive markets.

What would you replace markets with specifically?

Quadratic funding lets public goods be free. I can't see how it's extractive @memes