It's really not that difficult to find out information about how home educators manage various things if you are really curious.
You don't need to be a teacher to home educate, nor recreate an entire secondary school complete with lab, football pitch, assembly hall and so on in your kitchen. Groups and so on can offer things like science, many children/teens if they are motivated to do so will go on to study GCSEs, A Levels, BTEC qualifications and so on at colleges or as independent candidates. And BTW, a lot of these groups are free or not for profit, so run at cost, it's not that you need to pay loads of money to attend loads of clubs/groups. Of course, all the ordinary clubs - music lessons, sports clubs etc are still open to home educated children just as children at school can go to them. (Not currently of course, but generally.) And one of the perks of home ed is that you can specialise in whatever your child is interested in or good at or even struggles with (as long as you have the materials and resources accessible, of course).
You don't have to follow the national curriculum, you can follow whatever learning plan you like. Although yes it does involve some level of planning and effort from the adults, whether that is setting up detailed work plans and curricula or just finding resources appropriate to childrens' level and interest, and coordinating how and when to access them.
Abusive parents abuse children whether they are at school or not - it's quite a misunderstanding of abuse/control to say that abusers would want their children at home in order to abuse them more(!) and in any case home ed has always been an option, I don't see lockdown making loads of abusive parents suddenly go "Aha!" 
However I agree what is happening now is not home education but more remote schooling in isolation, which is a totally different thing, more like the kind of homeschooling done by children living in remote rural locations. I have a few friends who home educate and they are struggling without their usual access to groups and friends and facilities etc, as well.