Earlier quoted context omitted.
The problem is that the tools you need are "listening to and interacting with people in the target language". Human language is a problem of interpreting the creative social signals of other human beings, and there's no way to automate that. With the Web, YouTube and internet radio, the actual amount of target-language material that a person can expose themselves to is hugely, hugely more available than it was 20-30…
To learn conversational language, you really do need to converse. It is a much faster route to basic fluency. Apps like Marco Polo or even Zoom or Skype along with a native speaking contact are going to work more quickly than any gamified experience where you're only taking to an app.
Meanwhile, for many of those many, learning a new language is more than a fun pastime or intellectual challenge, it is a matter of economic or even physical survival. Duolingo's mascot likes to breezily inform me that most people using Duolingo in Sweden are refugees trying to learn Swedish. Don't those people deserve more emphasis on practical mastery, and less on social engagement? Do they have the money and opportunity to pursue quality interactions with native speakers?
If digital tools could provide reasonable sub-levels of mastery short of full conversational fluency, like ability to read a newspaper, understand a news broadcast or sitcom, babysit a child, or hold a business conversation in an office, I wouldn't complain. But I'm not aware of any digital teaching tools that prepare a person adequately for any of that.
Fine, digital tools are inadequate for reaching full conversational fluency. But should we then let them off the hook for not delivering any level of practical skill in a reasonable amount of time?
Is it really impossible for them to do any better at delivering real-world value?