Can this be true or are they just trying to play on my intelligence? Let me tell you, yesterday I was browsing the internet when something popped up as a notification on my phone, and when I checked, it turned out to be about getting 1 free ETH for just buying ETH. I thought it was just a marketing tactic until I went to the exchange that talked about it and I saw the same.
Remember that 1 ETH is now $4,300. Do you think they're so generous to that extent to give people rewards for just buying, either on spot trading, copy trading, or simple deposits? Anyone of these is allowed in order to get a good reward.
Honestly, this doesn't seem convincing at all, especially since 1 ETH is a significant amount at the current price, so it's highly unlikely that the exchange would give it away for free.
It would be different if the exchange held a giveaway for its users or held a trading volume contest with ETH as the prize when a certain volume is reached. This would seem more reasonable.
You should be more careful and cautious if this could cause you losses, as it could be a scam or something similar.