Maybe, but I can find a lot of warns about Market Makers. But if you smart enough and dont take bonuses and dont listen "professional" advisers or "best signals" and know how to trade, you can trade with them. And you must know real scam companies cant work in the market more then 1 year they need change the name every year. And as I know CySEC didn't provide licences to every company from last year.
And Everybody who trade with Market Makers must know, that this is not real market and every MM company can scam client. But in my opinion iqOption is the best MM company for binary option. As I told earlier I havent got any problems with them.