Nick Heer has a blog post about Meta charging if you want to link outside their silos:

Instagram has never supported links of any kind in individual posts, so that is a new feature with two links per month permitted for free, and more enabled by this pricey subscription — starting at $50 USD per month for four posts per month containing external links

How the turn tables… Remember when Australia and Canada wanted Facebook to pay newspapers for linking to their articles? This is some twisted karma. In both cases, paying for links is fundamentally anti-web.