It all depends on whether or not Deribit operates its own internal market maker (which also trades to profit), and whether or not they provide data to external market makers. Given the vulnerable nature of these platforms when internal market making is happening, you can be sure of the fact that the house will cheat on you to be on the profitable end of the trade. In other words, you have to assume these platforms will abuse their own position against you.
But till date, I haven't heard a single complaint about them like they've cheated any of their users (or else I've not yet encountered any).
The larger these platforms grow, the more there is for them to lose.
That's why I think that as Deribit is relatively new, it looks like a shooting star in the sky from which I can wish anything and it might come true, it's an early-bird opportunity for those who want to get rid of the dirty games that are being played at Bitmex through their market-maker.
Just think about it, if you operate an internal market maker, and thus provide liquidity to keep your platform active, whales could and likely will empty your pockets if you don't do anything to counter/bust their trades.
True, someone needs to lose money for another one to win, but at what cost? Stopping those whales by locking their accounts for any/no reason is good?
Funny thing about Deribit is that while their office is located in The Netherlands, people from there aren't allowed to use their platform.
Never knew this. But I don't have anything to do with it, I'm interested in getting in if there's really nothing (like cheating or account closure without any valid reason) going on there as I don't really want to experience the same thing I did at Bitmex.