EdTech is a broad market.
- K-12, Academia/Colleges/Universities, Industry/Training, Adult learning, increasingly experts teaching directly, and more.
Most people aren't aware of the differentiation of the categories because they get to work inside one for the most part.
The learners in each category are different.
Duolingo had it's share of naysayers and doubters, but it did provide it's own take on a learning outcome.
Your post does make me wonder about the existing spend in Education, and how much could/should be EdTech with today's capabilities, or even the capabilities of 10 years ago, and what looking at that with a lens like yours might show, if anything.