https://antonz.org/sqlite-is-not-a-toy-database/ — 240K inserts per second on a single machine in 2021. The problem you describe is real, but the TPS ceiling is wrong by three orders of magnitude on modern hardware.
Not everyone needs monopolistic tech to do their work. There's probably less than 10,000 companies on earth that truly need to write 240k rows/second. For everyone else, we can focus on better things.
I realize that. There are a few comments already that present use cases where I can totally see using Sqlite as a good option.
> Not everyone needs monopolistic tech to do their work
We are talking about localhost Postgres vs SQLite here. Both are open source.