Some people wanted Bernie, most didn't. That's why he didn't win. You have no idea what the DNC wants. The DNC has no authority to try and sabotage a Sanders presidency, that's a wild thing to say. There were some emails 7 years ago and those people resigned. They're not going to rig it. Or ignore the vote.
If who you can vote for IS decided by the Evil Capitalists, how did Sanders get onto the ballot, then get millions of votes in 2016 & 2020? How did he run a campaign without a superpac, beating out millionaires with massive campaign funds?
I guess it's cool if you think politics doesn't matter because it's all a conspiracy, it just means your political beliefs have zero chance of getting anywhere.