Do you remember Teletext[1]? The Internet for grandma and grandpa.
I just came across analog German television by mistake. There is an app that mirrors teletext on the smartphone[2]. I thought it was a joke, but they are serious about it and the operator seems to be able to raise the money to show it during a blockbuster on German TV.
Digitalization made in Germany!
Update:
Like the advertisement for a German erotic mail order company, this app is also a subsidiary of the station.
They always put the advertising of their own companies in there, as soon as no other company wanted to have the advertising block.
Thank you, Andrew for this information!
[1]
Wikipedia: Teletext
[2]
Teletext 71 APP Android