A girl my daughter (24) was at school with, is an influencer - and has been since she was 17 or 18. She's pretty (so photogenic), and starves herself to maintain the "look" which people want to see online (ie, slim). She gets a lot of free clothes, sure - and I think she's been on free holidays to places where she can pose on the beach in a bikini... but she's not happy. I don't think many of the influencers are, actually, because having to post at least once a day to maintain your "following" must be exhausting. It's probably like taking exams, every single day of your life... constant stress ("do I look good in this?!", "will people like my post and start to follow me?!") and misery, usually for precious little reward (just more exams the next day).
One thing they do tend to be, though, OP, is young, ie, under 25 when they start. And a good 95% of their audience are probably younger than they are. So you might need to point that out to your husband. It won't bring him happiness and riches untold, I'm afraid - just a bucketload of stress, loss of a happy family life, debt, and probably, MH issues.
My daughter's friend barely sees her family, and has admitted to her old friends, who're starting to settle down and have babies, that she's terrified of getting pregnant because "it'd destroy my look and I'll lose followers". How is that a healthy way to live life and influence others into doing likewise? Every time my daughter shows me an instagram post of hers, all I see, behind her mask of make-up, is an unhappy young woman. There's no sincerity to her smiles, and whilst she might have an enviable life and "look"... she's unable to close the door after work and say "no more until tomorrow morning", because she constantly has to think up new ideas, new ways to photograph herself in stunning locations and barely there bikinis. What happens to her when her followers move onto someone else, as she ages? She's never worked, because influencing is her full-time occupation. I don't actually think (although I might be wrong) that she has any qualifications above GCSE level, so would only be able to find low-paying employment. Sure, influencing seems great... but everything must come to a natural end - and then what?
(Disclaimer, I have an IG account, which my son set up as a joke - my posts are all about my very photogenic dog, and old knobbly trees that I find on our walks. The occasional cat creeps in, from time to time, but usually only when they're zoned out on catnip. I have 15 followers. Most of those are teenagers trying to build their own following up so that they can say "I'm popular, I have X amount of followers on IG!". I follow one person. My teenage son. And that's only because it irritates him...)