The game industry is growing by leaps and bounds. In 2020 alone, estimates place the market size at US$159.3 billion with a 9.3% CAGR.
According to data available on Steam, the median lifetime revenue per game is US$220,000 and the mean lifetime revenue is $2,669,000 (i.e. the tail is fat). These are extremely healthy profit margins considering the lower development cost of indie games.