If that is true, then not only digital tools, but all books, classes, tests and every other technique aside from what you recommend for language learning are fraudulent wastes of time.
Language learning courses and tools are just ways to kickstart normal language acquisition, so you don't have to go through the years of gurgling like a baby has to. Learning to communicate in a new language isn't exactly like learning some other kind of skill--it's much, much huger.
When you're speaking your native language, you're decoding and processing complex social signals in real time at multiple levels of structure (phonological, morphological, syntactic, semantic, pragmatic). Even the best AIs can only get a couple of these levels of structure, with significant error rates, and only in a handful of well-studied languages (there are hundreds or thousands of natural languages). How much time does it take for you to learn 1000 vocabulary words? A natural language will have tens of thousands. A comprehensive grammar of the English language would be dozens of heady volumes and have less information about English grammar than any competent native speaker.
Learning a language is just an astonishingly huge task. No course or system can cover it all. Mostly they're just trying to make things easier for you.
I have an uncle who speaks 6 different languages; he really likes picking up new ones. I once had a discussion about how he could pick them up so quickly and he basically said what the parent was saying: use it, practice it, read newspapers in it, speak to people that speak it too. Immerse yourself, accept that you'll be uncomfortable for a while, and before long, you'll be able to hold a simple conversation.
He also said you know you are fluent the day you can casually joke in real time with people and make them laugh (at the joke!)
