The confusion appears to have started after Have I Been Pwned (HIBP) creator Troy Hunt announced he had added a large dataset of 183 million credentials to the breach notification service. The data was shared with Hunt by Synthient, a threat intelligence platform that collects and analyzes information from infostealer malware logs. As Hunt explained in a blog post, the collection reflects years of infostealer activity rather than a single new compromise – and certainly not a targeted attack on Gmail.

Short version, 183 million computers have malware on them, and many people logged into their gmail accounts on infected computers.

Not sure I blame Google for this one, but you should probably delete any Google accounts just to be safe (and also stop opening .exe files you get from sketchy websites).