Is PeerJ a predatory publisher?

Could you please clarify for me if PeerJ is considered a predatory publisher? I've heard some conflicting opinions on this matter and I'm trying to gather a more comprehensive understanding. From what I've gathered, PeerJ operates under an open access model and utilizes a peer-review process, but I'm curious if there are any specific concerns or criticisms that have led some to label them as predatory. Your insights would be greatly appreciated.