People who say the Mueller Report found nothing never read the report.Trump blocked as much as he could. They gave up because Barr was coming in and vowing to get the people who started the investigation (thus got Durham which found 0). Mueller found lots, including 12 acts of obstruction of justice by trump.(Mueller said: “If we had confidence that the president did not commit a crime, we would have said so.") But he wrote he could not indict because of the DOJ memo, thus he tossed it to congress. They chose to not pursue. Barr misquoted it, andcthe rest is history. Also remember multiple indictments and convictions came out of this case.
They also tend not to understand it is a report about the decision of the prosecutor to indict or not indict, not an extensive list of everything they found or investigated.