You joke, but certification is important for some jobs, university admissions and visa applications in many countries.
For example Cambridge has a big program for English which tons of universities in the english speaking world use for admissions of foreign students
I don’t know if Busuu certificates are accepted anywhere major yet but it is not a bad idea, not every major language has standardized tests and rating systems like CEFR, there is room for new players especially in non European languages
It's very similar to Duolingo, but quite cheaper and has videos and certificates.