The only valid reason I can think of for the team to dump their own token is to take some to cover all the expenses they have incurred. Other than that, I don't see any, except of course to take profits for themselves.
Only logical explanation is simply to make profit out of their project, simply as that.
If I'm a WTC holder, I will be pissed off of course. The market is still in the worst conditions, so that timing is really that bad. I'm sure that it will just make the price go down more and it will not be good for those bag holders who believed in this project, it's a bitch move, to be honest.
What do you expect, even project owners are going to look to make money. This is the nature of the business we are in. That's why we really need to be smart, don't believed every project has a honest reason to stay in the crypto sphere other than to enrich themselves, sad but true.