Supermarkets are shifting more and more towards letting the customers do the hard work for them, Lidl is the latest to join that trend with the changes. Nowadays:

•You serve yourself (less wages for them to pay). What was once a paid job is now your problem.
•Self service machines; if you use cash it will give you the most amount of coins they can. 10p change? You bet you're going to get a few 1 & 2 pence coins in there because moving heavy coins and counting them costs supermarkets money... so they got the customers to take some of the strain off them.
•They raised the prices of everything to the point we're at now and put 'savings' on the stuff they need to shift. Check the yellow label/Clubcard discount prices in Tesco and compare it to B&M, Home Bargains etc. They're the same price. These false 'deals' are a way for Tesco etc to control their stock much more efficiently. If they need rid of it, it'll get a yellow label. It's dynamic pricing in a sense just it isn't so obvious.

As far as Lidl goes, the changes to their scheme is a huge change in direction similar to what Tesco are doing. Currently it's 2x bonus points on fruit because there's little shelf life on that. They want to cut down on wastage basically.

Before the changes I could spend £10 in Lidl per month and get a choco brownie as a reward. Now I need to spend £90 to get the same reward. It's a positive change for supermarkets and another kick in the balls for the customers unfortunately.