The law is STILL that you can't have more than 6 meeting OUTSIDE. Not inside. So that means you can't legally do this in your own home as a private arrangement.
And if you can only have a max of 6 then you need to be volunteering more than 2 hours of your time. So thats a bit of a problem.
As such this proves something of a problem in terms of where you are going to have this childcare and where you are going to have this childcare.
If you term yourself as childcare to get around that problem of the rules of private gathering, you then have to go down the more formal route adhere to childcare regulations and bubbles etc, with no more than 15 children. As well childcare qualifications, DBS etc.
An example: if you volunteer for an organisation like the Scouts, its basic safeguarding to never be alone in sole change of a group of children - both for their safety and your safety for a variety of reasons.
Again you are going to need people to volunteer for more than 2 hours to cover a full working week.
You also have to consider what the kids are going to DO for all those hours. That involves a degree of planning and resources. Thats extra time OUTSIDE those used for childcare. And that involves money.
If you decide to ignore all this you run the risk of falling foul of the law or other complications.
This also gives you a bit of a head ache in terms of where you have hold this childcare. As it stands many community halls will be closed - because of the law - and because if they do ignore that, they won't have building insurance and you won't have public liability insurance (if you hire a hall as an individual you are usually covered by the owners public liability insurance - which is one reason they won't hire out to individuals at the moment). Its therefore too much of a risk for them to hire out. Until there is a change in the regulations in how many can met and what is allowed to be open, this is a none starter for an option.
And again, who is going to pay for premises even if you can find them? All premises have overheads so even a minimal charitable rate is going to cost something.
That leaves you with office space. And this is where there possibly could be an option I guess. Employers could in theory use their space for on site childcare within the rules. And in terms of having enough people to run it, it could be in businesses interests to free up staff to enable this. However theres limits on the amount of space available and many places will have more staff wanting to take advantage of this than there is space. You also have the issue of training and DBS checks and how long this takes to set up.
You are also going to have to have someone set this all up, devising rotors, communication etc etc. Thats outside your childcare hours too.
In my opinion the idea doesn't fall down because people won't volunteer but of the number of hours you'd have to volunteer and because of the other practical problems and the limitations of the law around childcare and covid-19.
By the time you've managed all this, we could be into summer. The rules may have all change and summer groups allowed to run as normal anyway.
Nice idea. One away with the fairies that hasn't really thought about in a real world practical sort of way. Its pretty clear the OP has never done any kind of volunteering with children and the organisation it requires to run. Its the sort of suggestion that winds me up as someone who does understand this - it shows the sheer lack of understanding of all the hard work - seen and more to the point unseen - that goes into running schools, childcare and childrens activities either on a professional or voluntary level. People think its easy and that people just turn up for their shift and then fuck off home and don't think about it again until they are next there.
As I say, one to firmly file under 'LaLa Land'.