Firstly, I'm of course happy for anyone to write their software how they like -- I should say if you want to write "business ready" software, then that's great.

Firstly, I'm of course happy for anyone to write their software how they like -- I should say if you want to write "business ready" software, then that's great. Often such things are backed partly by company. A better phrasing might be, fun Easter eggs, like wishing users Merry Christmas, might be a good way to denote software which is free, but is not designed to be slotted straight into a for-profit business critical situation -- certainly don't come crying if something breaks on IE 11 or whatever.