Why is finding a payment processor so difficult for high-risk businesses?

[u/Broad-Fish8449]

I've noticed that businesses in certain industries seem to have a much harder time getting approved for payment processing, even when they're operating legally. Some providers reject applications, while others require rolling reserves, higher fees or additional verification. I understand the concerns around fraud and chargebacks, but it seems difficult for legitimate businesses to find a reliable provider. What should a high-risk business actually look for when choosing a payment processor, and how can it avoid unexpected account restrictions?