There are currently many exchange platforms and they compete with each other to get and retain more users. Actually, this kind of rewards are needed, at least to attract more users. And, isn't this already available in various exchanges? It's just that the form of rewards may be different.
Even the rewards given to its users are usually varied, it may also be in a certain period when we can claim vouchers, or get transaction fee discounts, or can get other rewards coins, and various other rewards programs for users. That's why if we use a platform, usually we will be given information either via email, telegram channel or in the application's news feature, usually there is an announcement, yes, we just have to be diligent in exploring the information.