alt Hacker NewsSQLite doesn’t depend on donations. They have a consortium, sell licenses (it is open source but some companies like the explicit CYA), sell support contracts, sell an aviation-grade test harness, and sell extensions.
Of course there is always the risk it goes out of business like any other company, but it’s not funded like your typical small open source project and doesn’t even allow open contributions (not necessarily a bad thing IMO but it’s just a totally different type of project).
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Is there a reason why more OSS projects don't follow this model? It sounds like you are saying that there are clear advantages here that other OSS projects lack.
pgbackrest also was part of an organization from what I understood from the post. The organization got acquired. I don't see how sqlite is shielded (or any project really). They could get acquired. They could not have enough customers. They could go the wrong directions and lose customers. They might have a few high profile bugs so that customers lose faith in them.
They don't make much off this, its known.