That’s because of AML laws.
Their account got flagged by OFAC—deservedly or not—and the company is bound from discussing anything about it under any circumstances.
The level it goes to is frankly kind of ridiculous, but that’s the legal regime financial services companies operate under. And that’s not to defend PayPal as a company either. Just that when you see people saying some company is horrible because they close accounts and give no information, it's (not always, but) very frequently one situation that’s entirely out of the company’s hands.