We cover self promotion and our requirements for disclosure in the Help Center:
you must disclose your affiliation in your answers
In practice this means any answer that recommends your own product must include something like:
Disclosure: I am the [position] of [company] that develops/distributes this software.
Although the above is talking there about full answers I think we should assume that it applies equally to edits made on the answers of others.
Any time someone suggests using a product, that is not mentioned in the question, I think the obligation to disclose that they work for the developers of that product arises.
There is a Software Recommendations Stack Exchange which has gone to considerable effort to provide guidance around how to ask and answer software recommendations questions, and it already has a tag for GIS questions.
Rather than us shadowing or piggy backing on that effort, for a set of questions that are problematic for focussed Q&A, my preference would be to try and redirect GIS software recommendations to that site which is set up specifically for software recommendations.
If we do not provide software recommendations then the problem of them being used to promote sales/use of particular products evaporates.
In the meantime I think it should just be called out when it is sighted, either via commenting like you have done on that answer, and/or flagging for moderation using the Other category.