Upvoters want to read and or partake in the discussion that will go with it.

I'd wager that for many of the users here, the discussions are routinely far more valuable than the linked content. The linked content and its title are merely the spark to go from. You'll often see people admit in the comment threads that they skip reading the linked content and go right to the comments.

It means the title: the way OSS is funded today is not sustainable - is of high interest, people want to have that conversation.

I'll chime in as a data point - I generally find the comment section on hacker news to be of way more value than most articles too.

"This thing is unsustainable but will go on indefinitely without a change"

This does/does not have substance kind of like a moebius strip does/does not have two sides.

Possibly because of the followup discussion thread?