Wasn't aware of LingQ, thanks for sharing it. Perhaps you are right about the targeting. Casual learners... but also busy people that would benefit from the format. We'll see.
IMO busy people need tools that give the most learning per time spent, not tools that feel easy at the expense of pace of learning.
These tools tend to require effort (e.g. LingQ, Readlang, Language Transfer) rather than ones that feel easy (e.g. Duolingo).
Extensive reading would fall in this quadrant. Trouble is that below a certain level you need lots and lots of graded readers. A somewhat improved version of OP’s project may solve that problem, providing an unlimited firehose of reading at an appropriate level.