I used Minecraft as an example for the original developer, who was certainly financially independent as a result of the success. For an ongoing concern, it is

I used Minecraft as an example for the original developer, who was certainly financially independent as a result of the success. For an ongoing concern, it is often the case that microtransactions, or additional paid features, are offered - some more 'strongly' than others - but if the core value proposition that was initially paid for remains intact, that seems reasonable. The excessive marketing of Minecraft monetisation by Microsoft, is certainly not something to praise, but it has not reduced the ability of original owners to continue playing. I can download the latest Java version (and server) and play completely offline on a LAN, with no problem, all as part of the price I first paid back when it was in alpha ~12 years ago. Realms need to be paid for, as they are the ongoing 'service' which needs to be funded.