Those are actions that should have resulted in his removal from office. Not all of them are crimes.
But, as far as 'criminal acts' go:
Michael Cohen went to prison. Trump was listed as an 'unindicted co-conspirator.'
The payment to the porn star was considered an illegal campaign donation.
The payment was embezzled from the Trump Foundation.
The payment was disguised as lawyers fees, which were then taken as a deductible expense on the taxes.
While the 'campaign donation' is not going to be something super simple to get a conviction on, the other two are pretty much open & shut. Fairly serious felonies.
Then there are a variety of tax fraud, real estate fraud and bank fraud charges that the prosecutors in New York (federal, state and municipal) are all gathering a lot of evidence to prosecute.
Trump has been fighting it for a long time. Most recently, he lost the court case where he tried to claim that the prosecutors couldn't investigate him (subpoena his tax records among other things) because he was president. His son has been dodging a subpoena for a deposition on one of these cases.
All of this has been building for a while.
The comparison to Nixon's pardon is not a very good one.
Nixon was a slimeball, no doubt about it. But he didn't come anywhere near Trump's criminal behavior.
Nixon resigned in disgrace. He knew full well that an impeachment trial in the Senate would have resulted in his expulsion from office.
Trump, OTOH, is still trying to convince his moron followers that he should be declared the winner.
There's an inscription on the Supreme Court. "Equal Justice Under the Law".
Trump should face the same justice anyone else would.
Not 'rich man's justice'.