There are 3 kinds of corrupt rich people:
1-This who built a fortune based on false promises, misleading advertising, or other immoral practices. Some people put Trump in this category.
2-Even worse are those from the group above who use political influence to become super-wealthy. They buy politicians, who are employed by the taxpayers and supposed to represent the people, to do their bidding and betray the interests of the taxpayers and the people who pay their salaries.
3- The lowest of the low are the politicians themselves who become wealthy by accepting employment from the taxpaying public. They pretend to do their duty as elected employees of protecting the interests of the people, but instead sell the people down the river for their profit and the profit of oligarchs. They are essentially large-scale con artists who undermine the very society they are obliged to protect. Millions are the world die from the actions of these criminals.
So, even if your opinion of Trump is low, he is still leagues away from the corruption that Biden embodies. There is no comparison.