is this really a good thing? once you start banning rentals in the 1-6 month range, you are no longer just targeting tourists. you're also hurting folks without stable jobs who can't commit to a typical lease length.
first of all, this is pretty uncommon outside of relatively high-paying professional gigs. the average person's idea of a "decent job" is probably quite different from mine or yours. also not all leases have a buy-out clause. you might be on the hook for the entire remaining term of the lease, which, on the margin, can change a new employer's willingness to pay. I actually just had this situation with my previous roommate. we had just signed a new one-year lease when he got an offer. they almost declined to pay out his share of 11 months' rent when they learned there was no buyout clause. this was a tech company hiring him as an SWE.
I don't know what share of short-term renters are doing it out of necessity, but I do have several friends that are in this position. I'll use one of them as an example. he dropped out of school with about a year's worth of credits left, so most white-collar positions are not on the table for him. he currently works in a restaurant, but he has a worsening health condition that makes this a short term option at best. he's trying to get into a trade that would be at least a little better for his health, but not having a lot of luck at the moment. basically he needs to be ready to get up and go at a moments notice to anywhere he can find better work.
My area may be an outlier, it is covid time afterall. But 40% is not an outlier, especially when it has an option in a drop-down menu.