Is it a bad idea to leave money on your Amazon gift card balance?

I get 10 or 25 dollar worth Amazon gift cards through Mistplay and I just put it in my balance and leave it alone. I have quite a bit saved up and I was reading on older posts that Amazon can ban your account and void your balance for seemingly no reason? Has anyone experienced this? After knowing that I’m thinking about spending it all but I really wanted to save it up more