Oh definitely weaker than concrete. But (generally) much stronger than the soil it's sitting on. The foam is going to have 3-4x the compressive strength of the dirt that's under it. So it's still an extremely useful material.
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Then I parry or raise you with https://www.madonnainn.com/blog/2019...ly-competition
and another for the pot The Madonna Inn: more than just a potty stop | Mom Central
In comparison, worked for an immense [nearly 200k employees] multi-national corporation. Their restrooms were famous too, largest cockroaches imaginable. Having plant built atop a horse racing track might have something to do with it.