Really helpful tool. Can be more so: Yellow highlight is too opaque; covers text. Could have a single "underline" tool for emphasis. Nice you can select and edit. For being in a hurry, offering Screenshot URL up-front would be great. PREMIUM seems unnecessarily expensive.
Why not TWO premium options: 1. lesser cost for students/budgeted with better tools, etc., and 2. BUSINESS who needs the space, features, etc for heftier cost where cost isn't a concern.