Either they will answer directly with something solid like "We're growing the team" or they will evade it which is still a meaningful answer for you. You could probe further with questions like:
"How has the team's headcount changed over the last 18-24 months?"
Basically you're alluding to 'employee turnover' without saying it.
Agree with the sentiment and this is a good idea regardless of skepticism about layoffs, but I think "we're growing the team" is not a solid answer.
This is a company that's potentially going to be giving you a lot of money. You should want to understand what they're hoping to get out of that investment. e.g. what are their short/mid/long-term goals and how does hiring you fit into that? Ideally it's clear to you that they have a lot of work they want to accomplish that seems reasonably aligned to what the business owners would want, and it sounds like something you want to get yourself into.
A great answer would be like "we've been acquiring a lot of customers lately and have been starting to run into performance issues, but we don't have the capacity to both handle that and also work on the feature requests we're receiving." Or "we're looking to expand into a new market which carries some new baseline requirements (e.g. FedRAMP) and need help building that."
This is a bizarre take, I've always asked questions like this when interviewing, and if a manager doesn't have a good answer I ask for follow up conversations with the team before taking a job.
Has it worked out? No, but usually they were all being lied to by upper management. Can't do much about that.
I missed a word in there, which was "has it always worked out", but on the other hand I've also dated a lot of people I didn't marry, and even in my original phrasing I think it would be very odd to not ask or try to suss out this information! If nothing else you'll learn later if people are truthful or not, or worth working with again in the future.
I think we're saying the same thing? Just asking about team size won't reveal the answer. So a different set of probing questions might have to be asked.
Either they will answer directly with something solid like "We're growing the team" or they will evade it which is still a meaningful answer for you. You could probe further with questions like:
"How has the team's headcount changed over the last 18-24 months?"
Basically you're alluding to 'employee turnover' without saying it.