  In this paper, we want to emphasize the pivotal role played by strings in the
model realizing de Sitter using an expanding bubble, proposed and subsequently
developed in arXiv:1807.01570, arXiv:1907.04268, and arXiv:2001.07433. Contrary
to the Randall-Sundrum model of brane-localized gravity, we use the end points
of radially stretched strings to obtain matter sourcing gravity induced on the
bubble wall. This allows us to reinterpret the possible volume divergence
coming from naive dimensional reduction as mass renormalization in four
dimensional particle physics. Furthermore, we argue that the residual time
dependence in the bulk, pointed out by some recent work as a possible
shortcoming of such models, is automatically cured in presence of these stringy
sources.
