The truth is that it's the only one fast enough to take the top positions in such a short time frame. However, many coins have experienced the same hype and projections and have failed to achieve that.
It seems different this time as speed is not just reduced but instant and there ar eno fees but... Who knows.
IMO, if raiblocks was in all exchanges, I would never send bitcoin to/from exchanges anymore. No fees and insta, which compared to bitcoin...
And still, I'm not sure what will happen. Lots of competition around. The best tech not always succeeds.