BRouter is intended for offline navigation rerouting and you can disable it at any time.
According to offline routing guide:
“Navigation: offline rerouting happens when you leave the current route and trigger a rerouting (automatic or manual), skip the next waypoint, avoid road blocks, etc. while navigating without internet connection. The route is calculated from your current location to the existing route (based on navigation type). Only this small part of the route will be recalculated and merged with the previously planned route. This ensures, that the rest of the route remains as initially planned.”
For Kurviger offline routing see below or customize BRouter profiles: