In my company in Germany, I have heard of four or five people using it. Among my acquaintances, around seven or eight friends have used Reltio in their day-to-day customer experiences. They told me about it, and I found it interesting. The foundation-level certification was free, so I started there.
I discovered that my company has a partnership with Reltio, so I could pursue more intermediate certifications. So far, I feel good about it, but there are still few customers using it.
Still there are less customers who use it, so I think the best approach is to have more consultants become partners or find more customers to use it. Showcasing it more in the market, on LinkedIn and other social media, would be a great start. There isn't much hype around Reltio compared to other tools with a wider customer reach.