They think it will help with more Flexibility and at the same time increase the cash returns .

BUT what am worried about is :
The market manipulation by Elon Musk that did happen this month on twitter , it was not only bad but at the same time it could mean that he plans to do such things in the future.

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I doubt he has "manipulated" the market. At least not yet. We could say he is manipulating the market if he started promoting crypto currencies after tesla invested in bitcoin. We have been seeing him being a big fan of crypto currencies and promoting them before all these happened.
But who knows what his intention might be. Maybe he is testing the market to see how much influence he can extert before starting to make profit out of it. But lets all take it in a positive way. Let us imagine he is a good guy trying to promote the usage of crypto currencies.