This is also key. China used converted stadiums, convention centers, etc for this after a few weeks. According to them, this reduced R from about 0.8 to about 0.3. People were actually being rounded up and taken to these places forcefully.

With the number of now empty hotel rooms we have, this could easily have been provided on a voluntary/strongly encouraged basis. Instead what we got in SF for example was hotel rooms for the homeless (that hypothetically could have COVID) and no hotel rooms for people that actually tested positive for COVID.