Lies, damn lies, and benchmarks. Using default configuration invalidates the result at best, at worst it's knowingly misleading.

Why? Because nobody who cares about performance runs their database with default configuration. Plus some databases, like PostgreSQL are well known to have very conservative settings. So benchmarking with the defaults like that is knowingly trying to make your product look better than it is. You didn't know? Then what are you doing benchmarking databases?!?

Seriously, this is shady as hell.