i'm going to echo @rkhassen9 observation that your pricing model isn't attractive to the average person. this is totally my opinion, but the value here is the amount of notes you collect. while the average person is not willing to pay to record note, businesses are definitely willing to pay to retrieve the notes of others. if you let people annotate an unlimited number of votes with an unlimited number of notes you will build your database faster. then you could charge businesses to have access to those notes via an API. on a consumer side of that, individuals could see all of their notes but can only see the last 5 recent notes for others.

all in all though, this is a really cool product and will definitely be a game changer as more and more schools and classes move to online.