Any time I see someone say this, they always fail to actually provide any examples of games that fit this description

Lethal Company is actually pretty fun if you’re playing it alone. That’s a positive example.

Another one is Don’t Starve Together. Great together, but Don’t Starve itself is also fun.

Among us on the other hand has no bots and you won’t have any fun without other players. However, you’d also not have fun without other players in Uno, Chess or Checkers.

Were these enough examples or did I misunderstand your point?

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I don’t agree that you have to make games be good beyond the multiplayer experience. I’d love it to get my money’s worth, if I can play the game alone AND share the fun with friends I’ll gladly pay extra.

As it stands, many friendjank games only cost a few euros so I can live with them not being fun after a while or without friends. After all I used to buy cinema cards for my friends and I and didn’t have more than a few hours of fun, and cinema cards are often way more expensive than friendslop.