So they just have to make good enough games to avoid two complete flops in a row. Which is impossible

BG3 made a lot of committed repeat customers for Larian, I don't think it's impossible their next game will sell very well based on name recognition and good will alone. A guarantee? No. But a safe bet.

It’s the equivalent of the rich billionaires saying if you want a house just work hard and buy one. It’s not hard! Why are the poor people complaining?

If this is the source of your rage posting, that's a lot of misguided anger to point it toward Larian. Are we gonna complain about the one-man developer who quit his job to develop Balatro? Yes he was privileged enough to have savings to dig into, but neither him nor Larian are anywhere in the same ballpark as EA, Microsoft, Ubisoft, etc. They're just the wrong people to get mad at.