TikTok Shop is not stealing your Amazon sales. It is feeding them. Most brands still treat the two channels like a budget fight, and that framing costs them both.
The moment, not the channel
A shopper sees a product on TikTok, doesn't buy it there, and searches for it on Amazon within a day or two. That search is branded, high-intent, and converts at two to three times the rate of a cold category keyword.
So the TikTok spend shows a mediocre in-app ROAS while quietly making your Amazon account look like a genius. If you measure the two channels in separate rooms, you kill the thing that's working.
$23K on TikTok, $38K extra on Amazon
We ran this with a beverage brand doing about $120K/month on Amazon and nothing on TikTok. We launched TikTok Shop with creator content, not polished ads.
TikTok Shop itself did $23K in month two — fine, not thrilling. Meanwhile their branded search volume on Amazon rose 61%, and Amazon revenue climbed $38K in the same period with no increase in Amazon ad spend.
The TikTok channel's real ROAS was roughly double what the TikTok dashboard reported.
What makes it work
Two things make this work. Your Amazon listing has to convert the branded searcher, which means the top image needs to match what they saw in the video. And you need to watch branded search as a TikTok metric, not an Amazon one.
Channels do not compete for the customer. They compete for the moment.