What's not to understand? If you have a specific question about the 'immediate negativity', perhaps comment on one of the puzzling comments to ask for clarification

For a general background, searching for 'paypal' reveals a thing or two: https://hn.algolia.com/?q=paypal

> - Thinking of Selling on eBay using Paypal? Think Again

> - “We found PayPal vulnerabilities and PayPal punished us for it”

> - We got banned from PayPal after 12 years of business

> - PayPal stops payouts to models on Pornhub

> - More Paypal nonsense

That's five of the top eight results. The last one pretty much sums up the sentiment of the whole page