Just an update that SharpTools shouldn't depend on OAuth after the account is linked anymore as we pushed an enhancement last night.
As for why SharpTools talked to the OAuth servers during normal use... most integrations like Google Home, Alexa, etc. only use the OAuth servers during the initial "linking" step. SharpTools may need to synchronize your devices again while you are using it -- and the device sync has one very small, but critical step where it asks Hubitat's OAuth servers for a list of your locations.
The update we pushed won't fix things for initial account linking as that fundamentally relies on Hubitat's OAuth servers, but it should workaround it for ongoing use. We now read from an internal location snapshot if you need to sync devices after the account is linked.
