Should it be the same for articles about tech companies? Or about the economy in general if you own some index ETF?
If I wrote articles like below I should explicitly state my investment.
"Why gold is a great investment"
"Why You should invest in Tesla"
"The Ark Space Exploration & Innovation ETF (NYSE: ARKX) is the future"
If your objective is to get your readers to do something that could financially benefit you then you should make that clear.
I noticed that some financial podcasts even have a disclaimer at the start of their podcast.
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Sorry I should have clarified in my original comment and said all articles shilling some coin