[philbarr]

How did they determine the "perceived desirability of the user"? Seems a little presumptious to me - I didn't even know what it was until I clicked the link, and the first thing they say is "we don't want you."

Well guess what - now I don't want you either.

[Permit]

He's joking. He's the co-creator of draw.io.

[philbarr]

Yes I get that now. Unfortunately, it's difficult to hear the ironic twang in his voice on an internet forum.

[davidjgraph]

Hello, world is ending, whether you sign up or we all make love, tomorrow it's all in vain...

[philbarr]

This almost feels like you're trolling your own post! :)

[stephengillie]

I took it to mean "instead of buying, try it out."

After hearing the part about the "perceived desirability of the user", I'm thinking maybe they only want to sell to certain people today, perhaps return visitors? Maybe they want all their new visitors to try it out before buying? They could have the button change based on cookies, and they just started an ad campaign that's on HN's front page.

Edit: This comment was unhelpful? If not, why downvote?

[davidjgraph]

Possibly, or given the source to whole thing is on github, you could just look at the HTML of the page there, https://github.com/jgraph/draw.io/blob/master/war/about.html