According several resources deribit is the largest market of crypto futures, this is why I have added here as platform.
I see! Yeah, that's also what I've seen but only on ads. I have to admit before I saw those ads (the ones on Brave browser especially) I had never heard of deribit. And then the complaints threads about them opened and that led me to suspect them. To be fair, there are complaints about all the platforms but I just thought it was a bit shady to never have heard about them until all those ads. Kraken probably the best bet I'd stick with that.