"As many people have pointed out in the IETF DPRIVE group, being observed using a privacy service may in and of itself represent a risk to the user."
On the other hand, if you are already using one or more 'privacy services' then adding to the available protections is all to the good.
Also, the more people using it, the better off everyone is - this should be the default DNS configuration, once available, just as https has become the default browsing protocol.