Well, first you can tune SQLite to get a 1000x speedup over 400w/s, without compromising safety too much. Second, the use case is small & local — I use it as an fprintf replacement.

Second, 400 concurrent users per second is a lot? If I had 400 users per second, with a 10 minute engagement time for 4 hours a day, I’d have ~10000 daily users. If they paid a monthly SAAS of 5$/user, I’d be making 600k$/year.

So… considering the implementation simplicity, that seems like a good trade off?