a sololearn app for each computer language?

Question

Why are there many apps by Sololearn on the app store? Do they have more information than the main Sololearn app?

Answer 1

To my understandings:
All those single sololearn apps like HTML, CSS, JS etc. etc. are merged into one main app for better user expierence.
They keep the old apps in case of affiliate marketing services/goals I think.

Correct me if I am wrong.