Re: Hard for them ?
In fairness to the "cloudy crud companies" it was only in December that HMRC released the VAT regs which definitively removed the absolute requirement to use "cloudy accounts rubbish" rather than a good old-fashioned Excel spreadsheet, which can then be emailed/posted on a USB stick to a tax agent for submission via API enabled software.
MTDfB is mandatory for VAT submissions only for businesses who are trading above the VAT threshold from April 2019; no formal decision has yet been made on whether MTDfB for Income Tax will be mandated, which won't be before April 2020, and MTDfB for Corporation Tax is still but a twinkle in the draftsman's eye. (We've got full detailed IT regs, and have had for rather longer than the VAT ones, because IT was supposed to be compulsory from April 2018 until they postponed it).
If you're that way inclined, the consultation on the VAT regs is open until 9 Feb; docs at https://www.gov.uk/government/consultations/draft-legislation-the-value-added-tax-amendment-regulations-2018