Here in 2020 lots and lots of people still have trouble reading.
Not as in being illiterate, but as in "I'd rather watch a 20-minute Youtube video explaining a technical topic that could be explained on half a sheet of A4, because reading is just too exhausting for me".
OECD recognizes 6 levels.
Below Level 1: Adults can read brief texts on familiar topics and locate a single piece of specific information. Only basic vocabulary knowledge is required and the adult is not required to understand the structure of sentences or paragraphs.
Level 1: Adults can read relatively short digital or print texts to locate a single piece of information that is identical to or synonymous with the information given in the question. Knowledge and skill in recognising basic vocabulary, determining the meaning of sentences, and reading short paragraphs of text is expected.
Level 2: Adults can make matches between the text, either digital or printed, and information. Adults can paraphrase or make low-level inferences.
Level 3: Adults are required to read and navigate dense, lengthy or complex texts.
Level 4: Adults can integrate, interpret or synthesise information from complex or lengthy texts. Adults can identify and understand one or more specific, non-central idea(s) in the text in order to interpret or evaluate subtle evidence-claim or persuasive discourse relationships.
Level 5: Adults can search for, and integrate, information across multiple, dense texts; construct syntheses of similar and contrasting ideas or points of view; or evaluate evidence based arguments. Adults understand subtle, rhetorical cues and can make high-level inferences or use specialised background knowledge.
Give it a few days and someone will build a service doing just that.