We've always used IB, but with all filters turned on. So far it's worked very well. But things have shifted a bit in the past couple of years.
Nowadays, very few inquiries come from guests with any profile or history or reviews or even a photo, so most don't qualify for IB, which puts us back into the vetting gauntlet.
I'm currently scaring away as many as 3 out of 10. They're usually groups of 20-somethings, often all male. And that's a very high risk group, so we demand a security deposit from that demographic.
And while that scares away most of them in that demographic, the ones that agree have so far kept the place in tip top shape (they want their deposit back, so they remain conscientious during their stay).
Those that do qualify for IB seem to be consistently great guests. So that's still working.
The good news is that if there's one thing Airbnb is good at, it's attracting bookings (even if most aren't ideal guest profiles or have other "issues"). It's a seller's market, so we can afford to be (necessarily) picky.
Inquiries on other platforms seem to be picking up a little too. They tend to be a bit less work, because other platforms have more filters for things like ages and profiles of guests, so they tend to weed out the questionable ones up front.. Presumably by not presenting your listing in the first place if the guest doesn't pass your filters.
Still, the number of inquiries from other platforms pale in comparison to Airbnb. You just have to be more vigilant on Airbnb. Not only vetting the guests, but trying to avoid the many inexplicable Airbnb "interventions" that can lead to penalties and loss of income, simply by employing sensible measures to protect yourself from the declining quality of guest that seems to dominate Airbnb nowadays.