No, the restriction is not new. They have been forbidding DRM on most or all Kiwis unless you are the only user for quite some time. (Note, the restriction I have seen has been when there is 1 or more other user already on the Kiwi.) I assume that this is due to DRM mode being a "resource hog".
WSPR readers are not random bots and are usually put there by the Kiwi owner (in my experience, though I'm not an an expert on that) and thus they can be connected indefinitely, if so desired - sort of "privileged" users.
Not all European kiwis have WSPRs connected. You can try Weston-Super-Mare in the UK, for example, which often (or always) has none.