OTC still works for me. But I rarely trade it. I'm suspicious of it because I can't see what's going on in the real world.
It could be that IQOption has some kind of algorithm to fluctuate the price getting your entry OTM whenever possible. Maybe I'm too paranoid in this regard but I noticed that so often it happened on my end.
And the price movements are just not realistic.
Most often it trends forever and the price moves so smooth it's almost as if the candles were Heiken Ashii smoothed but it's not. Now it would be easy if you could just trade the trend but when I tried it then it seems to always turn.
But if some can make good money on weekends consistently that's great.
I personally prefer the more erratic real FX prices, because many times you can catch a hard dump or spike to counter trade it or use certain patterns that occur often.