Yes, you should. You should ask yourself why they only accept bitcoin as a means of payment. It would seem obvious to us to accept as many payment methods as possible. In case of a scam, ponzi scheme or some other form of fraud you will often see them promising one of the following:
- Outrageously high return (eg 10% or more per month).
- Guaranteed profit (there is no such thing).
- You receive a commission or kickback when you bring in new users or investors.
- The owner of the website or company is unknown.
If you are in any doubt, please feel free to contact us. We might be able to provide you with advice.