I can understand a paid pro tier. Content takes up server resources, after all, so this is a legitimate implementation of a subscription, as much as I might hate them.

And yet… markup is text.

Only text.

And text takes up almost no drive space at all.

Drive space - even now, with the AI datacentre bubble - is still stupidly cheap. I could understand if the subscription is metered to the amount of text; say, 10¢/mo per 1,000,000 characters. Or to a mix of characters and links.

But $29/year? How many hundreds of full-sized novels worth of text are you expecting people to link to?