Yeah, self employed have been screwed, especially if you have a business that's only a few years old and has been growing - because the income figures are being calculated using averages going back to 2016. So if you say, started a business around then,let's say:
2016/17 made a loss because you set up (lots of self employed use cash basis accounting so set up expenses are against yr 1 income)
2017/18, £10k profit
2018/19 expand business at start of year (using a loan/personal credit card/savings, again not unusual for self employed), 20k profit - steady income started after expansion
2019/20 Steady trading, £40k profit
But when it comes to calculating the seiss grant, your average income would £10k, even though you've been making £40k profit for the last 18 months plus. This isn't an unusual profit growth profile really, loss at the start, small profit, then a decent income once established.
Can you imagine if the government had told employed people their furlough would be based on what you earned 4 years ago - tough shit if you were a student, in training, on mat leave...there'd have been uproar. But self employed people who tried to highlight problems just got accused of cooking their books and told it was just desserts for being tax dodgers. Often on MN
And that's before you consider that plenty of self employed people have business expenses that don't just vanish. Rent on premises, leased vehicles etc. There's also a missing month compared to furlough