I think we need to cast our memories back a little.
The furlough - or Covid Job Rentention Scheme - had to be introduced very fast.
If I remember correctly, the legislation was passed the quickest in history.
It had to be passed quickly, because millions of people would have lost their jobs, then their homes etc and the benefit system would not have coped.
Because it had to be passed quickly, the government had to accept that some people would, legally, financially benefit from it.
In an ideal world, with all the time, they could have put in rules. For example, if your furlough payment is £2,500, you cannot get another job. Or employees would have to declare all their outgoings and then a decision could be made if they can get a second job.
But any rules would take months, if not years to sort out. They only had weeks.
So, there was a choice:
a) Pass the Furlough scheme quickly, allow those on furlough to work 2nd jobs unrelated to their main employment. The risk, a minority of people hugely benefiting from furlough and 2nd wage
Or
b) wait to pass the furlough scheme. Bottom out all the rules, I.e individual circumstances taken into account. Ensure only those in dire financial need receive furlough. The risk, no one gets any furlough support for months.
The reality is, with any scheme you introduce, some people will benefit, some people will remain the same and some will lose.