Yes, but also, vendors are best positioned and most incentivized to be the lenders for their customers. They often just provide unbeatable terms compared to all options, even better than cash for those who do have that option and ability.

A financing company usually is fully taking the credit risk. They have to charge a high interest and hope their underwriting process is sound. That is generally the only way they make money from the transaction.

A vendor have give 0% interest or even a discount to financing customers because they are protected by the profit margin of the transaction. They can also have a looser underwriting process and take more credit risks.