Here are my reasons how can I said you're not asking but promoting this scam website :
I could be wrong too, let's wait other members comment and share his thought
There is something in what you say, I suppose. This account has a huge gaps between posts, he woke up just for the purpose to post his referral link.
I would never trust such behavior, especially if promotion is done by newbie account with 7 posts.

It is beyond any doubt that trustcapital.ltd is scam, it is offering unrealistic returns and has signs of a fraudulent scheme.