I was going to say it sucks because we have to signin AND pay but I didn't notice you gave 5 accounts to test. I just tested is not for me but It works, nice gimmick. Maybe consider a free plan?
Thank you for your response. Indeed, I have considered offering a free trial, but currently, the computation costs are quite high: converting 2 minutes of video costs me $1. Therefore, it's challenging to envisage a free trial, but I am still contemplating a balanced solution.