Sololearn can add more ads if they want, it's such an amazing learning platform after all.
However, I'm pretty sure more ads will promote pro version; or stop some of our Sololearn using for good 😂 (considering what it shows as ads🤢)
Mirielle🐶 [Inactive] if you are mostly writing code, being the awesome coder that you are, or are involved in the Q&A section, you won't see any ads. However, if you do challenges, you will see ads of length (IIRC from 5-30 seconds duration), which was my point. However, you can press the back button etc. and skip the ad within a fraction of a second.