This is hilarious and incredibly impractical. Unless the mouse part itself is stellar, there's almost no way this could supplant using a real computer/mouse - using a bad mouse makes using a computer awful IMO, and the likelihood of the actual mouse being very good is incredibly slim (not to mention how heavy it'll land up being)
To be fair on the heaviness point though, people add weight to their mice for wireless ones in the form of batteries, and for gaming ones actual literal weights. The raspberry pi is only 45 grams, so it is at least conceivable that this mouse will be a suitable weight. I do however totally agree that a first-time mouse making company probably won't do a great job of making a mouse.
