I guess it'some sort of stupid excitement. Some Crypto YouTubers do so mostly when they are trying to shill a coin, an exchange or a service. But what they don't know is that they are usually making themselves a target

Perfect example was Ian Balina, back then when he had Millions USD worth of shitcoins. He would take screenshots of how much profits he made not knowing that he was digging a grave for himself. He got hacked and things have never been the same for him