Data tends to be valued based on volume/amount; enterprises have more data and with it comes more risk. As a result, they vet vendors more rigorously to control the risk.
Vetting vendors has a fixed cost. On the small end, it becomes challenging to bootstrap a business when you have a high amount of fixed costs so it's often forgone until a size threshold is reached. This same sentiment is frequently reflected in government regulation as well
Would you be okay with your doctor putting his notes on you in the website? Would you be okay with your accountant putting all of your financial data here?