I totally think that when a Vox Media publication writes about Comcast that they should disclose the fact that Comcast Ventures owns a minority stake in Vox Media. However, I think it's a bit ridiculous to expect them to disclose this every time they cover one of their investor's portfolio companies. According to Crunchbase [1], there are 1,124 companies that share at least one investor with Vox Media. That's a pretty large list for editors to keep track of. I'm not aware of any publication that provide disclosure statements when they cover one of their investor's portfolio companies.
I think the challenge arises in ascertaining whether or not there is an adverse incentive driving their reporting on a given story.
In the case of Snap it seems safe to conclude that someone asked them to write positive stories. The need to disclose all potential conflicts arise because we cannot trust the authors of these sponsored stories to honestly disclose that that is what they are.
"It seems safe to conclude that someone asked them to write positive stories." As the author of the article in question, I can tell you that this is false.
Yeah, that's asking a lot of journalists. We all know that writing high quality pieces is what Vox is famous for, I guess they just can't be expected to have the time to put something like "journalistic integrity" or "proper research" into what they write.
[1] https://www.crunchbase.com/organization/vox-media/insights/i...