Continuing malpractice by some umbrella companies is HM Revenue & Customs’ failure to stamp it out.
Opponents of the Trades Union Congress (TUC)’s call this week to ban umbrella companies claim that the “real problem” with the bad practice in the market is HMRC’s failure to take “a proactive approach” toward stamping it out, based on the information the government agency has.

Also, opponents have challenged the TUC to proactively ask: “How can the contractor workforce best be protected?”

https://www.recruiter.co.uk/news/2021/07/tuc-wrong-ban-umbrellas-still-place-ethical-firms