You shouldn't just click on the YouTube Premium 1-month free trial

A 1-month YouTube Music Premium free trial popped up, so I clicked it, but it charged me and then showed the 1-month free trial message.
I called customer service to ask what was going on, and they said it appeared by mistake because I had already used it once.
I applied for a refund, and they said it was approved.
These free trial banners are scary.