It is difficult to consider the influx of companies to btc as a "pump and dump scheme". Every visionary knows that the world is constantly evolving and changing, and since the start of the digital world (internet) that sooner or later, a new digital currency was bound to surface.
The btc train is a moving train, and most companies and individuals with enough resources are looking to join in and catch the gains, before the price value becomes stable. So i will say to the best of my understanding that to them, "Btc is considered a long term investment".
I would consider it a pump and dump scheme but in this case it is a legal and subtle. Pump and dump is prevalent in stock market so why is bitcoin and crypto market exempted to that fact. Grayscale has been around the market for a long time and I think that they are doing that scheme to make money because they are an investment company. Bitcoin might be a long term investment but if you know how the market works and you have the money to make it move at wherever you want then you can earn while aiming for long term investment.