Being married to Harry is both a gift and a curse from a business point of view.
Respectfully, I disagree. If you're trying to launch an online retail business, being married to such a high profile Royal is ALL curse. The public doesn't engage with Royals in the way we do with celebs. We hold Royals to more stringent and suffocating standards: we don't like to see them bigging themselves up; we don't like them to have a visibly extravagant lifestyle; we don't like them overtly selling things.
Royals aren't meant to be celebrities in themselves; they're meant to be ciphers through which the achievements, trials and tribulations of non-royal, ordinary people can be showcased and highlighted.
Ex-Royals who have made it commercially (eg Fergie) took YEARS and had to sit through a LOT of ridicule and contempt before finally being affording a grudging toehold in the commercial sector of their choice. Or there's a degree of separation, and a niche product, like Duchy Originals or whatever it's called.
H&M are not and do not behave like ex-Royals. They want the Royal stardust, but they (or at least Meghan; I suspect that husband and wife are not entirely of one accord on this matter) also want to be a big selling mainstream commercial enterprise.
I do not believe this is tenable, for a number of reasons which I won't repeat for reasons of space and not wishing to get boring. But all my professional experience for what it's worth (not much, more successful PR agents can always be found) tells me that a brand strategy this confused and divided won't work. It's already, visibly, not working. And it won't ever start working.
They can have Royal or they can have celeb. They can't have both. Of course the Queen saw this straightaway. Important life lesson - always listen to your Elders! They know things.
If Meghan's career strategy was always to be an A-List Influencer and Retail Guru, and she wanted to make herself a marriage that would assist her in that aim, then she should have chosen a someone who is successful in that world.