Lazy? How much money do you think these creators are making from these free downloads?
Largely they are passion projects (hobbies) that take an extraordinary amount of personal time. I'm sure if you offered them $100k a year to work on it full time they would take that deal and there would be regular updates and they would be cranking through releases left & right.
We are not entitled to their work. I'm grateful that we have so much content available.