Stake was developed in the background of the success of their sister site Primedice under their parent company Mebit. While the owners understood the downfalls of primedice and the inability to include the sports betting system into it, they started developing stake. The success of stake was because of their initial userbase from primedice and also heavy marketing through social media, influencers and celebrities.
It is not easy to setup a casino in the current scenario, because now so many casinos are running well and are making profits or losses but competition keeps on increasing.
I only knew that Stake and Primedice are from same owners and Stake was created after Primedice through forum members years ago but I did not know about information like both casinos are from a same parent company Mebit, as well as reasons why Stake was created.
Your information is like the main reason for creating Stake is sports betting, but years later there are more bet products on Stake and this casino has no longer had only sportsbets for users. Difference between Primedice and Stake is mainly in sportsbet, have it or don't have it.
I checked after reading your post and your information is very correct according two following articles about history of Primedice and Stake.
https://www.igamingtoday.com/the-history-of-stake-com/https://www.thespike.gg/reviews/stake-com/owner