Every so often, Zooniverse has a project of special interest to the iNaturalist community. Their latest is designed to train a machine learning algo to accurately transcribe notes on herbarium specimens. This is supposed to help save a lot of time in the specimen digitization process.
The whole project involves humans identifying text so a program can learn how. There are probably places where it is difficult to decipher the text, but Zooniverse is pretty good about providing “I don’t know” buttons so volunteers don’t get forced to make bad calls.