Is that a URL shortener? Please post the link with a fully disclosed address. I’d like to see the content on the other end, but don’t know where it’s going to take me.
https://urlex.org/ can expand these for you.
a.co links always go to some illegible Amazon URL, so I think it’s fine to use them.
1. You can see it is Amazon
2. If you click it and are expecting "product A" and instead you see "product xxx" you probably won't proceed further.
3. This is Amazons fault, not those that have posted short URL's. There simple is't a longer URL that says: http:// amazon.com/this-is-the-product-you-were-after-just-in-case-you-are-skeptical-of-a-short-url-given-to-you-byu-someone-you-dont-know-beware-danger-will-robinson.
Example: https://www.amazon.com/LG-Electronics-70UK6570PUB-70-Inch-Ul...
Slainte