They will try to centralize blockchains and design them to collect our personal data in a way that we can't completely control it. The shady corporations are involved in identity management. Don't assume all identity management is bad, this however is an attack vector.
Completely investigate and routinely Boycott these large corporate structures with a shady past or flawed power oriented structure. Even if they get it completely right (economics may force them to get it right to survive), they can steer it in a new direction when people start rely on them. Just like going to your local farmer's market or growing your own food, keep the technology decentralized, open, and in the hands of the individual.
For sure, the banks are investing in blockchain technology. I saw a post about Goldman Sachs's Circle and another one called Revolt...Visa is eager to make a move and I've heard that JP Morgan and Chase are investing/financing ETH.
I'm all for people making investments and making money off the best cryptos out there but we need to be very aware of the attempts to infiltrate and control certain blockchains.
I think they will indeed start to steer things in a new direction. You're analogy of buying at farmers markets is perfect. Power to the people.