A very good question. I've just checked and it's possible to view other players' Steam profile page, as it would be with any other online co-op game. This isn't the same as your Steam ID though, it's just the public-facing info you have on your profile page. I actually haven't even set up my steam account in all the years I've had it but I know that other people have set their profile to private or public and this is all I someone else is able to view of a private Steam account page:
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So it's profile pic and username, nothing more than that and both of which can be edited. I opened the options menu and I think I can request to follow or friend the private profile but that's it. I really appreciate you asking this - I'm going to edit the post with updated information based on your question.
A very good question. I've just checked and it's possible to view other players' Steam profile page, as it would be with any other online co-op game. This isn't the same as your Steam ID though, it's just the public-facing info you have on your profile page. I actually haven't even set up my steam account in all the years I've had it but I know that other people have set their profile to private or public and this is all I someone else is able to view of a private Steam account page:
So it's profile pic and username, nothing more than that and both of which can be edited. I opened the options menu and I think I can request to follow or friend the private profile but that's it. I really appreciate you asking this - I'm going to edit the post with updated information based on your question.