After seeing this comment by konfusd, I decided to do a bit of digging.
I then came accross 'The Warehouse Group FY21 Annual Results (29/9/21)'. Powerpoint here
(p11) "We have confirmed the rollout of a unified loyalty programme across the Group as “Market Club” and “Market Club+.”
I also just got this email:
"From tomorrow, giveit is taking a short break while we make some changes and put the finishing touches on our updated programme. We’ll be sure to keep you in the loop and let you know when the new programme is up and running.
In the meantime, you can continue to shop with The Warehouse in the app, online and in-store – just without giveit.”