Giveaway tokens are difficult to guess. Is it useful or not. Maybe you will get the token, but you don't know whether it's valuable or not. I agree with this statement. And I think that is true.
they are announcing this kind of giveaway to attract users to follow their twitter account. after they get a thousand followers, they will change their username and create another account with the same strategy.
Now it's easy to make erc20 tokens. You can learn it yourself. Maybe because of that many are giving Giveaway.