I used to be able to to set location (like work) without a hub and use basic things like mobile presence sensor that don’t use a hub.
I had to recently remove my phone because presence status was stuck (joys of using SmartThings). When I tried to add it again it now forces me to link a hub.
Are you using the Classic App? If so, when it asks you to log in, select “New User” and then enter your Samsung Account credentials. This may get you past the “Add a Hub” process.
Yes classic app. But apparently the solution was to add mobile from marketplace instead of “Things” menu. Adding from marketplace does not ask for hub.