Just my opinion, when JM first started sharing her (still questionable) recipes for Sainsburys, The Post Office etc by video, she has a team behind her. The results while a bit cringy were acceptable.
The collaborations 2020/21, Hellmans, Del Monte, Linda McCartney and all were probably reeled in as JM got the DKL gig, BBC1 presenter! Perhaps her agent got in quick before actual broadcast.
They would have thought they were paying for a team, JM wanted it all for herself. The results speak for themselves and future collabs? Unlikely!