This is not a new strategy at all, if I still remember correctly, this strategy is as old as scam itself in the cryptocurrency ecosystem.
And it did be very important for us to all know that that which they give as the bonus are real bitcoins, those are just numbers the scammers enter in the user's account.
If you want to verify this, get your bitcoin deposit address and scan it on the blockchain Explorer, you did see that that address contains zero bitcoins, which tells us that the supposed 0.2 bitcoin balance on the account is nothing but numbers the scammers enter into potential victims account.