OK. Time to put you out of your misery. A couple of people identified one different use each. No one got the third. Honorable mention to @Amy D. for getting the first.
Here are three images demonstrating each use, as mentioned in the vendors’ advertising and packaging. This is my one in white; green clashes with my eyes!
First up and first mentioned on the packaging is a fish scaler.
Next is what I will call a knife basher to be used mainly with a Chinese cleaver to cut through bones. I think this use is mostly for people with lightweight cleavers or blunt cleavers. Put it on the blunt end of the blade and thump the tool with your fist. Only in extremis do I have to resort to such tactics and bashing the top of the blade with my rubber mallet works better and doesn’t bruise my hand. Using my heavy duty bone cleaver renders it redundant.
The bronze medal goes to those who put the contraption on the sharp end of and use it to stand up on the counter. I never do that either. I lie it flat with the business end pointing away from me.
I really only bought it out of amusement. The equivalent of $1.50 USD
Unusual though, to find one of these novelty things that have more than one function.