He is the incarnation of it
He has done it all of his adult, (well, age-wise) life. He did a Hulk SMASH! every chance he got. He screwed anyone he could along the way, just like we see now.
What would expect from a god of corruption in the pantheon of capitalism? You could easily gauge his behavior as pResident by his track record. This is a horse you would have bet on to do what his doing to this country. No shock. No surprises. This is the person you elect when you want to destroy a country. It is not a mystery or a hidden secret and you don't even have to ask another country to dig up any dirt. There is a HUGE pile of it in plain site and...the stench!
Trumps Wealth Built on Stiffing Scores of Contractors, Businesses and Employees for Years, Report Finds
The overall ugly picture that emerges goes far beyond Trumps use of bankruptcy court, where debts can be forgiven or restructured depending on their category and type of federal bankruptcy filing. Whats most provocative about USA Todays reporting, which goes beyond previous accounts of the same tactics or his mob connections, is how Trump has a longstanding pattern of ignoring his bills and walking away from debts owed contractors and employees.
https://www.alternet.org/2016/06/trumps-wealth-built-stiffing-scores-contractors-businesses-and-employees-years-report/
Meet the (Many) Small Business Owners Stiffed by Donald Trump
Recently several media outlets have dug up a handful of business owners with worrying tales to tell of Trump's bullying, unfairness, and failure to pay. And while their numbers aren't huge, there are enough of them to suggest a pattern of behavior that raises questions about whether pre-politics Trump was much of a friend to small business in practice. Here are a few of their stories:
https://www.inc.com/jessica-stillman/meet-the-many-small-business-owners-stiffed-by-donald-trump.html
And on, and on, and on...ad infinitum.