Well… not really. I tried out Russian and Spanish there just to have a look. They clearly are centred around idea to make you believe you will learn without effort at all to make you coming back and watch adds.
EDIT:
I am sorry to bring it up but this video is full of straw-man arguments and simple fallacies. Duoling tries this methodology and fails drastically.
One very simple neurological fact: you use different part of the brain speaking mother tongue and foreign language. You need more just than input to learn in effective way - you need provided your brain with information about language to help the process. Thats why analysing what you read help a lot. In fact: that how you learn to read you native tongue as well. Good teachers help you to break down how sentence works to it make it easier to read it.
Do you know why in Ancient Roma reading was consider very high lvl skill? Spoiler: they tried to teach in that way exactly. They did even bother explaining how letter works and just were asking to “read” after the teach until your brain will understand it. I took ages.
I agree with general sentiment but is based on falsehood. Unless you are naturally gifted person you will not learn by immersion alone. Millions of foreigner living abroad and doing just that are prove to this claim. There is a lot of them that never master language of country they move to. I for sure didn’t since I didn’t put any effort to it.
Please don’t take it personally. It is just an opinion on what I know and hope to understand. It is likely to be wrong