if every government turns their back with cryptocurrencies these companies will be force to sell it all out leaving the whole market in awe.
No government has ever turned their face to any cryptocurrency, so there is not need to fear of them turning their back, but they just can't fight against Bitcoin, so only thing they can do is to make more regulations.
They are probably thinking like this - If you can't beat them, then better join them.
Companies invest in many things not only in Bitcoin, so they are not stupid to crash the market like that and even if they want to do taht it would not be so easy.
Had anyone asked yourself why they suddenly a of them starting announcing they bought them? Why they dont keep the old strategy buying a share and stay quiet. I never heard them talk they bought a Tesla share. But I am sure they have them. To me it looks totally like a pump and dump situation. Whales are accumulating when price is cheap. And at the moment price start rising so they cant buy cheap anymore. But anyway their bags are quiet full already, they start shilling that coin so it pumps and then dumping start. Similar happened in first half of 2019.
What you saying is illegal for them.
Companies are not like bunch of guys who smoke joints and degen trade like that all day.