Often, imo is used with a polite but direct tone. Sometimes, but not always, this is understood as the writer having expertise on a topic. “imo” is often read and misread as conveying an arrogant tone. In My Humble Opinion/imho attempts to alleviate that concern by directly conveying humbleness. Some prefer to use IMO Instead of IMHO because of the reader is to judge wether the opinion is “humble” or not.
TakeDown.NET -> “IMO”