Why would this be the case? I'm not challenging your claim, I'm just curious. Is the idea that the UK wants to give tax breaks to small businesses?
> Europeans almost never have comparable healthcare costs to the USA, so that part isn't universally true either.
Not sure about self-employment, but American professionals take home (i.e., after taxes, healthcare, and retirement/pension) considerably more than their European counterparts. To the parent's point, it's quite a lot more difficult for an ordinary (i.e., not-self-employed) American professional to get wealthy by following the approach outlined in this article, but it's quite a lot harder still for our ordinary European professional.
You also get to write off business expenses and reclaim VAT (sales tax) as a business, which a normal consumer cannot do.
Your point about remuneration is spot on. But remote work for US clients is possible and I’ve found that they’re happy to pay close to US rates for UK remote.