If all things are absolutely equal other than Salary, the company only needs one person, and Bob will take the offer for $50K less--then, yes, they'll probably hire Bob. By virtue of having an expensive lifestyle--and, presumably, more local options--Sally has priced herself out of remote work for companies that genuinely don't care where employees are located.

Of course, real life is more complicated than that and all things are rarely equal.

ADDED: GitLab actually explicitly states: "All things being equal, we will hire people in lower cost markets vs. higher cost markets."

Sally might not have a more expensive lifestyle than Bob, but might be aware that a similar company is willing to pay $150k. And therefore not accept the offer of $100k.

Not a remote one playing by "everyone region has same pay-rate". Because if there is another one and paying more, then Bob, would also apply there.