Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Quick question about Ory Network customization of Kratos flows. If I want completely custom flows I have to host the UI myself is that correct?

Depends on what you mean by completely custom, but very likely yes 

You can still use Actions to get in additional validation etc while using Account Experience but if you want to do e.g. multi page signup, you need a custom Ui 

Yes, multi page signup with a few non-auth related steps in between

Would you also happen to know is the MAU that you pay for is based on the active sessions per month. And an active session is active until it expire. E.g. 720 days lifetime means that that session is paid for for two years, or only whenever the session info is requested/interacted with?

only whenever the session info is requested/interacted with - we don't count inactive long-running sessions if the user isn't doing anything