In ARIN you must meet one of the two criteria: Multihome Unique Routing Policy So it is optional to be multi-homed _IF_ you have a unique routing policy.
…, OR - have a unique routing policy Examples where Unique Routing Policy may be necessary include things like transit marketplaces where you may select only a single provider for transit and may not peer with more than one provider at any given time, but you still have a unique routing policy and are (potentially) changing providers more frequently than could be rationally facilitated without BGP and an ASN.
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