Which technique is unethical and can be a reason for banning?
 

Hello friends i want to know Which technique is unethical and can be a reason for banning?

All the black hat SEO techniques are unethical or spam generates techniques.
These are few black hat SEO techniques-
Cloaking, Link-exchanges, Duplicate Content, Buying Links, Keyword Stuffing, Hidden text, Link farms, Over-optimization.

Unethical techniques,

1. Keyword stuffing
2. Cloaking
3. link Exchange

Link bating
link wheel
keyword stuffing
cloaking