I routinely share my Starlink with other cruisers. Just like any other wi-fi hotspot such as Starbucks. You need the network ID and the password.
When we were in Huatulco MX, a crusty old Frenchman on a wooden sailboat came in. He had sailed nonstop from Coos Bay Oregon!!!! I have him my Starlink credentials. He offered me money - I told him to pay it forward (stock answer for me)
Peter