I don't know about 'odd', Matthew: it looks rather formidable (give that word French pronunciation??) to me. Look at the speed they're going at. And, in its own way, rather elegant - I like the Canadian canoe shape of the main hull.
If multi-hullers really want to 'raid', won't they have to organise separate events? (Although come to think of it, there were a couple of sailing canoes with outriggers at the English Raid at Falmouth in 2014.)