Listing the specific problem that led to a service denial could be helpful, but could be not. I bet that it's very rarely something like "You did <this one forbidden thing>, so we ban you according to the rule 3.6.4.2 of ToS". It could be something like: "The pattern of your activity is very similar to patterns of activity of 9823 known scam attacks". Or even more detailed: "8 out of 11 statistical models analyzing 982 parameters of your activity during last 48 days showed the probability of your account being used for illicit fund transfers above 0.92, and the remaining 3, above 0.57. In particular, our 100M-paremeter AI model (link to a PDF with technical details) has classified your activity thusly: (a 20-row table follows). According to the law, we use a publicly available model, widely accepted as a standard in the industry. You can inspect the model's weights at huggingface (link follows)".

Interpreting such results is a job. Disputing such results in a court, or with an arbiter, would be really hard, unless you're a practitioner of the pattern-recognition craft yourself.

I had my Venmo account frozen. I'd only made about three payments. Two to a food bank and one to a school organization. Via email, they said the decision was permanent and their policy was to not discuss why the decision was made. Luckily for me it was only Venmo, which I don't really need to use.

This is one of the consequence of strong Anti Money Laundering law. Bank much prefers to avoid False Negative (letting money launderers operate).

They can't even get the legal system to function, how are they going to fix ALL corporations?

Some of best examples are the juvenile and and family court systems in a state like Ohio. Not only do they not even TRY to do what is fair or right, they have one simple mandate, pay for their own existence. As soon as the system set up to punish children is made to profit off those same children you have a sick and broken system but thats where we are today. So, VERY little chance we are going to convince a company to make less money for the social good when even out children's courts are run like a business.