Seriously, who's supposed to believe that a billionaire who was born with a silver spoon in his mouth is anti-establishment?
I think you underestimate someone as successful as Trump in a leadership position. Most people do politics as a career, they have to suck up to 'x' and 'y' to get ahead, which means obligations later on. Eventually, when you get to the top, you have tons of people with dirt on you that you have to appease.
Sponsors also become a major issue, since you have to do as they say in order to stay funded.
Then you have Trump. Doesn't owe anybody anything, doesn't give a flying fuck about his political career because he's already massively successful. He can do what he wants, how he wants it (within the confines of the system of course) without an image to uphold, or a career to take into consideration while doing it.
I'm a huge fan of making politics a non-paying job*, so only those without self-interest can take part. Corruption would still be somewhat of an issue, but you'd get a lot of people that want that power to do something meaningful, rather than be an empty suit collecting a paycheck.
*(In Hungary, being a member of the Assembly is a job, with pay. Not sure about other places, such as the US. )
A good place to start would be to publicly fund elections and ban all campaign donations, lobbying, and potentially even the appearance of corruption with threat of removing the eligibility to hold or run for office and maybe jailtime depending on severity.
I think that's a fair point, but you also have to consider who is buying off politicians and why. People like Trump. This could easily be him cutting out the middleman. So, although he doesn't have the same tangled connections lifelong politicians might, he's still part of the establishment and part of the problem.

- Climate change is a hoax "created by and for the Chinese in order to make U.S. manufacturing non-competitive." - not a policy, but widely indicative of the policies one believes in. e.g. "I don't believe poverty is a problem;" clearly tells you that the speaker won't do anything to fight poverty and won't worry about adverse effects, right?
- Obsession with coal as an energy source, promises to heavily deregulate coal and natural gas mining and use. - Uhm, how is saying you're going to deregulate an industry not an actionable policy position.
- He will "cancel" the Paris Climate Agreement - Again, this is really just a policy of taking the exact opposite course of action as the person before you, but telling people you'll pull out of an agreement is definitely an actionable policy.
- "The Department of Environmental Protection (Environmental Protection Agency). We are going to get rid of it in almost every form." - 'I'm going to remove the EPA.' ... how is that not a policy? It's a very very clear action with real consequences.
- "70% of [federal] regulations can go." - Again, a very clear action in removing business restrictions and limiting citizen protection.
(especially when his actual policy is going to increase funding to 'America's water and environmental infrastructure')
...
Funny because in his policies he is literally allocating billions extra to "fix America's water and environmental infrastructure".....................
This is why you should actually LEARN THE POLICIES instead of going off whatever 2 second sound byte CNN wants to feed you. Because this is literally the opposite of the truth.
I mean I specifically asked for policies and all you can think of are short little quotes with no context? Um, ok then.

Holy shit you do know 1 of his policies.
"Rewriting the tax code to allow working parents to deduct from their income taxes child care expenses for up to four children and elderly dependents."
>evil nazi scum wanting people to be able to afford child care