I already was thinking for a while what the business model of open source was exactly. Why does Google spend money on Chrome also? After Zuckerberg’s comments it hit me:

Open source is useful for a business if it can either increase revenue or decrease costs.

Examples:

Increase revenue: Chrome and Visual Studio code. For example, the more people code, the more likely it is that they pay MSFT. So VS code aims to make programming as attractive as possible. Similar for Chrome.

Decrease costs: Linux and Llama. As Zuckerburg said himself IIRC, they don’t want one party snowball into an LLM monopoly so they rather help to get the open source ball rolling.