if you are hiding stuff from your spouse you have larger issues that you should acknowledge and address. With regards to the article parents needs to disable in app purchases on any device a child can reasonably be expected to get access too
You could hide stuff from your spouse for many good and bad reasons. Maybe you are preparing a surprise gift and you took photos. Maybe your spouse has a bad spending habit and will ruin the both of you, so you hide the other bank account. Maybe your spouse is abusive and is threatening to leave you at any moment, so you hide money to get ready for that day. Maybe your spouse parents are calling you regularly to see how they are doing. Maybe, maybe, maybe.
[Posting sort of anonymously] My spouse and I will probably never see eye to eye on porn. I agree that it's a bigger issue, but do I need to address it?
For me it was a matter of porn not being as important to me as she was so the porn had to go. Plus for some people, porn does affect their own interactions with their partner negatively (reduces sexual drive, reduced sexual interest in their partner since s/he isn't like what they see in porn, etc.). Some people also view their spouses' watching porn as a sign that the one who doesn't like porn is inadequate - which leads to all sorts of insecurities coming out.
As usual, different strokes for different folks. Whether you _need_ to address it is entirely up to you and what you want from your relationship.
(I do know couples who both were into porn and that didn't cause an issue)
Neither my primary partner or I are particularly into porn - it's just really not our thing. That being said, I think a sense of solo sexuality is a really important part to any intimate relationship but that's just, like, my opinion, man.