> Internet exchanges don't have acceptable use policies.
The traffic through an IX (like SIX) is governed by a rat's nest of bilateral peering agreements, and those bilateral agreements have AUPs.
Peering exchanges are nice, but are effectively a corner case optimization on the modern internet. You still need a default route from somebody, and the major carriers all refuse to sell default routes through peering exchanges (for understandable reasons).
Everybody who will sell you a link with a default route will insist on something vaguely similar to an AUP.
Autonomous systems don't depend on a default route. It's not difficult or expensive to set up a BGP router. The labels attached to these contracts and agreements are really beside the point. If you want to play the Internet game then it's worthwhile to play it as an equal. If you host your business in the cloud then Amazon has shown us today that they will delete you like a bad YouTube comment the moment people weep and wail on Twitter.
If you're going to do something like parler, your own tin, in your own building (with a contract that doesn't refer to any acceptable use), your own network range(s), your own AS, and fibres conncecting to multiple POPs.
Fibres and building contracts typically don't allow the service provider to cancel except for very specific cases (not paying the rent for example), and are long enough that alternatives can be sought ahead of schedule if the company no longer wants to deal with you.
The traffic through an IX (like SIX) is governed by a rat's nest of bilateral peering agreements, and those bilateral agreements have AUPs.
Peering exchanges are nice, but are effectively a corner case optimization on the modern internet. You still need a default route from somebody, and the major carriers all refuse to sell default routes through peering exchanges (for understandable reasons).
Everybody who will sell you a link with a default route will insist on something vaguely similar to an AUP.