So big companies have generally donated to political campaigns and as such they should not, traditionally, have their investigations quashed because this would raise suspicions that there had been a quid pro quo.
Do you know/think/recall if that change a result of the Bush administration having a more lenient stance towards regulation, or was it a result of one administration almost always reacting to the prior one?
That said, political considerations do mean that Presidents are hesitant to overtly step in on specific cases and usually prefer to set general objectives. However the President can step in on a specific case if he wishes and that is actually explicitly part of our system. The President can set aside a conviction with a pardon or prevent it from being prosecuted in the first place.
No.
Big tech will likely drag this out as long as they can.
Unlikely. https://www.bloomberg.com/news/articles/2019-07-03/the-next-...