It helps people create videos to share fast. Quik for desktop - the possible replacement of Studio, does offer some basic video editing features, such as video trimming, putting together hi-lights, adding background music into video and similar.
Some calls on the GoPro team to bring it back, but only to get a disappointing reply - 'There are no plans to offer Studio as a download again.' Customers couldn't get it from the official site ever since.
But things changed since it was removed from Quik and reached its end-of-life for support in middle 2017. GoPro Studio is an advanced HD/4K video editing program for those whose installer was attached with the Quik package. In early years, many GoPro owners got used to making quick edits with GoPro Studio on their Mac.