"You don't think it's strange he hasn't sued me?" Musk said before it was revealed he might be sued.
"At least let the boys get saved first."
Heavy rains could cause even more flooding, complicating their evacuation.
Rain continued to fall in Chiang Rai on Tuesday, and is forecast to intensify on Wednesday.
The 12 missing boys and their soccer coach have been missing for eight days, trapped inside Chiang Rai's vast Tham Luang cave complex.