When reading fast, we tend to read first/last letters and the 'pattern' of the whole word and not really read the spelling. In this case, Reticulum is not very common or a familiar word and most folks would first read (or rather 'see') the word 'rectum'!
Just one UI suggestion - in a bright room, I had to spend a few moments to figure out where to type as the borders around the text box was very faint and nearly invisible till I clicked on it. Either make the text border brighter or better still, why not place the cursor in the text box by default on page load so that txt box is highlighted by default?
Does anyone know if other Apps (like BaconReader for Android) have similar volumes and so have similar pricing issues ? There are a good number of options on Android for reddit clients - though I would assume the user base is more fragmented across multiple clients and would not have the volumes of Apollo..
https://pubmed.ncbi.nlm.nih.gov/23089042/ https://www.dictionary.com/e/typoglycemia/