"Competing interests" not disclosed? retraction?
Assuming that their company can potentially gain from their research results, this is a clear violation of the signed competing interest declaration. The fact that the authors' affiliation is a company does in no way remove their obligation to declare a potential competing interest. In fact, Springer Nature specifically includes present employment as an example of a competing interest that must be declared:

Recent (while engaged in the research project), present or anticipated
employment by any organization that may gain or lose financially
through this publication.

Whether or not you should contact the editor is up to you and depends on how sure you are that their company does in fact have a competing interest. If so, then the violation is pretty obvious (although bear in mind that just because the authors work for a company in the field does not automatically mean they have a competing interest). If Nature Communications doesn't think this is relevant you can then follow up with a question here, how inappropriate the academic community thinks their lack of action is and how strong your case is that the company has a financial interest in these results. But I would expect their editor to act on this information and issue a correction or a retraction.
Springer-Nature is one of the world's most important and biggest publisher of scientific results. Their policy is not a weird aberration but represents the norm of a large scientific community. This requirement to explicitly declare any competing interests is standard in many scientific fields (such as biomedical research). For example, Elsevier also requires authors to explicitly declare their competing interests, and authors can only declare  that they have no competing interest if they certify the following:

The authors certify that they have NO affiliations with or involvement
in any organization or entity with any financial interest, or
non-financial interest  in the subject matter or materials discussed
in this manuscript.

In the example here, the authors would not be able to sign such a statement because they do have an affiliation with an entity with an interest in the subject matter.