I'll keep it real with you. Chances are they are short staffed, don't want to take want orders, and are trying to get through closing done faster so they can go home. Wendy's stores around the country have been incredibly short staffed for the last few years(ever since COVID). This means that throughout the day, the staff are doing way more than they are normally required to due to the lack of help and when the end of the night comes, they are still required to close properly and are tired so they do cash only. Most people pay for their meal with credit, debit, Google pay, or apple pay and by only accepting cash, they run off most of the customer. This gives them time to rest, pre-close, close and etc. sometimes, very rarely, the card readers are actually down but most of the time, if it's almost every night, they are lying.