various thoughts of potential reasons:

Rendo is no longer truly able to make vendors enough money to live off of, and no longer has a broad audience viewership

Rendo is changing in ways that vendors disagree with & feel the need to migrate their most viable & current items to a different venue

Rendo & Daz are now in some sort of partnership behind the scenes

Whatever is causing this egress has some sort of NDA involved, which is why us poor Rendo shoppers are not being given any advanced warning of losing items from our Wishlists or the MP - most vendors themselves are not this discourteous