I wouldn’t say it’s necessarily overuse of commas, it’s how it consistently uses them the same way in nearly every response. It’s something about the overall structure of what it spits out. I wish a linguist would pop in and break it down for me. It’s a combination of tone, tense, arrangement of the sentences, how the paragraphs are put together - all of it feels very samey to me, unless it’s prompted otherwise.

There’s only a few “styles” of sentences it spits out and to me, it seems quite obvious. Humans don’t write that consistently all the time, they’re messier.