Bingo.

And that leads into a few reasons to perhaps tip a bit MORE than ususal, assuming of course you are in an establishment where tipping is customary:

There is a good chance your are dressed at or perhaps even below the normal minimum for the establishment. If they have bent the rules or come close to it for you, yuo should be nice.

In a way you are representing all cyclists. The next cyclist may well be treated better or worse depending on how you act.

Finally Bicycle touring involves really meeting the people and seeing the places you are going, in a way even car camping does not match. That can include actually talking to servers and often they turn out to be great sources of local information. Tipping those who depend on it for their livelyhood is the flip side of the coin.