What is this ? Banned Validators

Are those validators who left or scam validators ?
I was always wondered how terra checks if a validator is legit cause i saw few also inactive on social media like


DYOR. No handholding.

thanks read about jld how they get kicked off tho do you know about the last vallidator i post it ? is he legit have you heard anything ? social of his are 1 years old without posting … i looked at him as he gives the highest rewards !