Maybe popular, but not as popular as now. Gamblers are learning sports betting now, unlike before when there were only a limited number of sportsbooks, which is why there were fewer users compared to now. I also played with Cloudbet before, but based on my experience, their withdrawal process is not instant and you have to wait for hours before it's processed.
Correct. Sportsbook is on the peak of popularity currently since most of the sports is now covered by the bookies. Besides, it’s already the main selling point of most casino especially on higher leagues of different sports such as football, basketball, MMA and many more.
Another sportsbook I've used in the past was Nitrogensports. I think they were more popular than Cloudbet, but it's sad their reputation was ruined.
Directbet.eu. this one is very popular too as it's a decentralized sportsbook, however, they close their business probably due to regulatory problem.
I never try Nitrogensports since they just born right after directbet.eu was closed while I’m still using cloudbet that time. But I remember they are the first one who introduced e-sports betting in the forum.