Their terms lists (bolded which ones I believe did the verdict)

How long you’ve been in business.
Whether your industry has a higher likelihood of chargebacks, refunds, or fraud.
Whether your account has had a higher than average number of customer disputes, claims, chargebacks, bank reversals, or refunds.
Whether you’re selling products or services in advance (preselling orders).
Your processing history with PayPal and other providers.
Your business and/or personal credit history.
Your delivery time frames - whether there are extended delivery timeframes.
If there have been significant changes in your business such as: large increase in daily or monthly sales, increase in your average sale price, increase in your dispute, claim, chargeback, or refund rates.