As far as I know, using shopback might resulting the seller getting less money from Lazada platform, this is true for Taobao using etao(official cash back platform for Taobao/Tmall), so this might be true for shopback too.
But it works difference, as etao required the seller to allow promotion for their item, while shopback don't has this kind of requirement.
So I guess so far shopback only taking money from Lazada as a promotion money, so it don't affect any seller revenue.
---Random tips for Taobao cashback.
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And ya, don't think about using shopback for Taobao, you can use etao for Taobao, it will give the money to your Alipay account after 16 days you confirm received the items, while giving you 3 year to use these money that store on Alipay.
It also providing higher cash back, while supporting using Etao app on your phone instead of crappy/laggy web mobile of Taobao on shopback.
You can also check did the order is tracked on etao or not just by placing order, and also showing did the red money allowing cash back or not.
(red money can give revenue to person that promoting Taobao, so it had this kind of limitation)
So before money is paid to Taobao, you can already see it is tracked or not, then proceed to make payment.
Sometimes you can get some items on Taobao with high rate of cash back, like 50% of the price, and there is hidden voucher too.
Combining voucher + fixed amounts of cash back, you can get the item for free.
Just ya, the shipping is something you need to worry about, unlike shopping on Lazada with shopback la, one click, then just make order.
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Anyways, back to topic.
Shopback really need to create a shortcut that allowing you to jump to Lazada much quicker, instead of opening shopback, clicking on one of the Lazada app icon, found out it is a top up Lazada for the last record, then killed Lazada app to reopen it, and jump back.
Why not just allowing the customer to creating a one click shortcut that jump to Lazada App via shopback automatically..
Lot of time I just want to take a quick look on Lazada without thinking about cashback, but shopback opening slowly, so most of the time I just open Lazada app instead of jumping from shopback.
And I hope you don't created shopback account yet, you can seek for any old shopback customer to invite you to register shopback, and get RM 5 for both of you.

Sorry, don't quite understand this part about it being a "found out it is a top up Lazada for the last record, then killed Lazada app to reopen it, and jump back". Your original sentence was"Shopback really need to create a shortcut that allowing you to jump to Lazada much quicker, instead of opening shopback, clicking on one of the Lazada app icon, found out it is a top up Lazada for the last record, then killed Lazada app to reopen it, and jump back."
Are you talking about the 2 links for Lazada (1 for mobile reload and 1 for Lazada home page)? That you clicked on the link for mobile reload when you actually wanted to go to Lazada home page? Sorry, not familiar with Shopback and with their TnC, don't want to end up not getting the cashback.
Already create shopback account through yoodo link which gives me $10 cashback.
. My 1st and only transaction through shopback so far is just a mobile reload. But even then, had to try a few times as suddently get "suspicious activity detected"
Thank you for the Taobao and Lazada information.