Yes, of course, they can.
The Seller may expect the Buyer to show interest, evaluate the product thoroughly and otherwise carry out all the due diligence required before placing the order. But that’s not a legal obligation on the Buyer.
They can jolly well ignore the product and buy it and, at a later stage when they’ve engaged with the product better, find defects and either seek returns / refund or move to consumer court and other redressal agencies. The Seller can do nothing about it.
This happens quite often online, especially with Millennials and Gen Z customers, as I highlighted in Why Do People Trust Reviews Even Though Half Of Them Are Fake?:
Let’s take the typical purchase funnel shown below:
Baby Boomers and Gen Xers generally place an order at the ACTION stage i.e. only after traversing the AWARENESS, INTEREST and DECISION stages of the AIDA funnel whereas I’ve observed that many Millennials do so at the INTEREST / DECISION stage itself.
Let me illustrate this with the example of apparels. Anecdotally, younger people are comfortable buying clothes online whereas older people are not. The stock reason given to explain this behavior is, younger people are “more tech-savvy”. I don’t buy this. Regardless of age or generation, it’s equally painful to select the right fit, size, and color of a dress and otherwise navigate an app adequately to reach the ACTION stage. Older people don’t reach this stage, ergo don’t order clothes online. On the other hand, younger people tap the BUY button at the I or D stage itself. But, mentally, they’ve not made up their mind to buy the items. Instead, they wait for the clothes to reach them. They try them out and keep what they like and return what they don’t. In other words, they reach the ACTION stage only after receiving the goods. Therefore, the stakes of fake reviews at the point of order placement on the app are low.