Does anyone know where I can find a TL;DR of the whole Grayscale bitcoin trust thing? I have heard some people say that they wanted to become an ETF because th

Does anyone know where I can find a TL;DR of the whole Grayscale bitcoin trust thing? I have heard some people say that they wanted to become an ETF because the trust doesn't allow them to sell the bitcoin, only hold it. Is that true? I really don't understand what's happening.