Can I get data from their data source?
The simple answer is NO.
It would be like saying "United and Qantas buy airline routes from governments, can I buy one?" Answer, no.
(If you think this is "unfair" or "data should be free" or such, unfortunately it's just a case of "whatever".)
"Have corporations made it so individuals do not have the right to access this data ourselves?"
I mean, lots of people believe government should not exist, gold should be the only money, government should control all industry, Euros should be the only money, all Disney movies should be freely available, Disney copyright should last 750 years - "whatever". You're talking major social-political paradigms. Nobody on this list cares, this list is for questions like "how do I use my chequebook" - ask on politics or history if you want to discuss it and/or rant about some particular position on the issue.