Seems plenty do given the number of influencers who have made it into basically a career. I in some way share your cynicism towards it, but there are plenty of jobs we don't "need" yet don't look down on in the same way. For all you know this guy's wife is spreading valuable information and genuinely helping people. Not all influencers are Andrew Tate and such. Hell my wife's cousin is big into legos and has a thriving instagram showing off their builds and talking about what goes in to them. Tons of hobbyists genuinely enjoy their insight. I don't see the harm.
If that value is actually improving people’s lives it’s another matter, but from an economics standpoint it seems to exist.
I'm all for people sharing their knowledge and hobbies to inform others but the term 'influencer' has a connotation in which they are earning money from 'influencing' others and that seems an awful lot like basic advertising to me.
And I'm all for them getting paid to do so. I'm not sure where you draw the line. Is a cocktail influencer sharing a cool hobby or pushing a product? The answer is usually "both." So where do they fit in for you?
Whether or not they monetize that via advertising or not it’s largely irrelevant to that value proposition.