If the pay cut isn't too large, this could still work out to a net increase in real income, just because the cost of living in Nashville is about half of San Francisco.

Let's do a hypothetical. Glassdoor suggests Lyft support makes about $40k a year. Let's suppose a cost of living in SF of $35k a year. (Our imaginary support rep is young and spends a little recklessly. Ah, youth!) Now, they up and move to Tennessee, and take, say, a 15% pay cut. Now they're down to $34k/year; how will they make ends meet? Well, their cost of living is halved (18k/year) - they can take a little bit of a lifestyle upgrade and still have $10k in their bank account in December.

Moving across the country is a rough proposition, but unless Lyft is asking for something like a 30% pay cut, the salary is a carrot and not a stick.