It's been a while since I've been on Hinge, but Hinge is not like Tinder in terms of edgy/risque conversation, and I played every conversation with a match safe. I woke up one morning and was banned. They say you can appeal, but this seems like mostly something to make you feel like there's a possible recourse.
What I gathered from Reddit is that it's actually rather easy to get banned by simply not talking to people. There were a few times where I wouldn't message someone right away from not having a good ice breaker, I was busy, or the conversation just went nowhere and people would unmatch. When you unmatch with someone it asks if you'd like to report them as well. Since Hinge is meant to be a more serious dating platform, not talking to people can be seen as not taking the platform seriously and trying to hook up or something and if this happens enough times it seems Hinge will flag your account.