What are the current ways to merge reviews? Which one is relatively less risky?

There are two ways, one is to merge your own links, the other is to merge other people's links.
 
At the same time, the contract itself is divided into one category and different categories. The method is very simple, but the former is basically risk-free, while the latter may be split by Amazon, and there may be serious abuse of variants.
 
There are two ways to merge other people's links. One is to merge zombie links. There are also related software on the market that automatically crawls some links that have comments but the products are not on sale. However, it is easy to be complained and split. It is unnecessary to answer irrelevant questions in the comment area just for the sake of rating. If the link is downgraded, directly merging it will also affect your own links.
 
Another way to merge links across sites is to merge links that are still being sold. In short, there is no such thing as absolutely safe to merge links, even for the same brand and category. If the products are very similar and in the same category, transferring some old models to FBM inventory adjustment 0 is currently a relatively safe way to merge.

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