It's hard to meet people's every expectation when you're running a tour service. Especially when people assume things like this person did when they wrote, on a review site, that "We went on a canoe trip but were very disappointed that no one told us there would not be a bathroom on board. It was very inconvenient". It's probably safe to say they weren't aware of what a canoe actually is before they booked their trip.
The only thing canoes have in common with ships is they both float. You would certainly never expect there to be enough space on a canoe in order to put a bathroom on one.