Very bad? Really! It was my understanding that companies account for that, they expect it even, since they make staff replaceable by nature.

In any case, it's a gamble. I fear that if too many people leave none of the original staff will remain and management will suck.

Good advice, I should ask some of them before they leave.

I meant a very bad sign for employees or potential employees when trying to guess whether it's a good place to work.

I once took a job with FAANG-level pay and realized too late that their annual turnover was 30%. It was extremely unpleasant to find out that it was that high for a reason. I left quickly.

This happened to me and the people interviewing me had left by the time I started!

Having some turnover is expected and accounted for. It varies by industry, but in tech it's pretty high at usually around 12-13%. The problem is when a company's turnover rate greatly exceeds the industry norm because it means 1) they're spending a lot on employee acquisition, training, and efficiency loss due to knowledge leak, and 2) there's probably one or more bad reasons why so many more people are leaving the company than is normal.