1. Same team behind "Changelly", which has a lot of complaints.
That for me would be reason enough to ditch Minergate entirely. I have had to deal with Changelly in a negative manner as well, which was at the time I was looking to convert BTG into BTC, and the transaction was non existent for more than 24 hours. After quite a hefty delay in response on Twitter, they sent a message just stating 'solved'. No sorry or something in the form of an apology. I even asked them what the reason was because I had more BTG to convert, but have never heard anything back from them. I luckily got my Bitcoins, but there are loads of people not having seen anything back from them. For that reason I don't even understand why Coinomi is still using them....
It's not a scam right now, but if they keep treating their customers in a poor manner, they'll ruin their reputation more and more, which at some point might give them the impression that they have nothing to lose anymore, and then bemmmm. Ignoring this service is the best way to fight it, because the only thing where they can be hit successfully, is their wallet. No usage means no income for them.