A lot of discussions on forum are all about "what coin should I buy? Why?"
Here's the opposite - I want to ask what alts you would never buy and why so.
My example:
Never buy BTT, Tron, Stellar and other coins where the tokens are giving away with all kinds of airdrops. Why? Emission grows with no influx of investors.
Doubting about Peercoin. Hybrid emission system doesn't seem reliable too, though lately PPC began spreading itself via well-known exchanges (changheangel or changelly - don't remember).
+ Libra. Not sure if any explanation needed.
Yup, there are really lots of altcoins that won't make any profitable margin so better stay away especially from those with suspicious activities even the advertising ones. In this industry, every "promo" could be too good to be true so always be careful. Read and confirm first everything you saw online and then decide as wisely as possible so you won't be a victim of those scam projects.