Working groups are not the DAO. Working groups are funded by the DAO, but they are not the DAO.
No, it doesn’t. Names still go to auction, and everyone still has a chance to acquire the names.
It’s not free ad infinitum. As explained, the amount of money behind this initiative is restricted to funds that are approved by the DAO each term. There are four funding windows in a year, and funds requested for this initiative will likely be made in two of the four windows if this initiative is successful.
It does cost the DAO something — the opportunity cost of this initiative is that the DAO misses out on registration fees from the names that are registered as part of this initiative.