Cleared of conspiring with Russians the two specific crimes(hacking and bots) which nobody thought he had a hand in in the first place.

the Trump campaign, or anyone associated with it, conspired or coordinated with the Russian
government in these efforts

despite multiple offers from Russian-affiliated individuals to assist
the Trump campaign.

• Withholding, manufacturing, misrepresenting or otherwise tampering with evidence;
  
• Interfering with efforts by investigators to perform their official duties;
  
• Lying to an officer of the law under direct questioning; or
  
• Lying under oath during a legal deposition, grand jury proceeding or criminal trial.

And depending upon the circumstances and the evidence against you regarding your own actions, you may further be vulnerable to additional charges of public corruption and / or being accessory to that crime after the fact.

So, just because Robert Mueller didn't inquire personally into such matters in his capacity as Special Counsel, it doesn't therefore mean that Trump's out of legal jeopardy. Far from it. Remember, he's already been directly implicated as "Individual 1" in the commission of two separate felony campaign violations.

Much was made over the past two years about Congress protecting the Special Counsel, when, of equal concern, should have been the public dissemination of the report.

It was for this reason that I have felt that the Special Counsel should have provided public information, including explanations of indictments, along the way. Most believed the silence of Mueller to be a great virtue--he speaks through his indictments, as interpreted by TV attorneys.  That should be enough. Just you wait.

Now the Mueller Report, essentially, joins the Trump tax returns.  Both under "audit" and kept safely in Putin's storage locker, to be released the day after Melania's promised press conference on her immigration story.  

Mueller's charge was to investigate---investigate any links/coordination between Russian government and individuals associated with Trump's campaign and matters that arose from such investigation. An appointment necessitated because of conflicts of interest in the DOJ, including the required recusal of AG Sessions, who lied to the Senate on Russian interactions.

Was it OK for Trump to fire the  FBI director in order to obstruct an investigation into himself, confirming to Lester Holt on TV as well as to get rid of that "nut job" to ease the pressure as told to Sergey Kislyak and Sergey Lavorov in a weird Oval Office meeting, held without US media but reported by Russian media.

And, of course, repeatedly threatening to fire Sessions for recusing himself rather than protecting him like a common Roy Cohn. And, Mueller, himself, we where led to believe, was in jeopardy. To top it off, there was the dangling of pardons to potential investigative witnesses against him. Some would see a pattern here.

Mueller could draw no conclusions whether or not his two-year long investigation was obstructed. Rather, he left it to Trump's  AG to determine this over a weekend.  Barr's appointment, with his audition letter might even be, itself, an obstructive step.