Remote learning is mandatory and families are expected to ensure attendance online in the same way we are expected to ensure school attendance during "normal" times.
That said, there is not a court in the land that would convict for non-attendance at the moment, it would be too controversial and local authorities do not like controversy. They are unlikely to refer for fines without a solid case. This does not mean carte blanche for non-attendance, though, and parents must make all reasonable efforts to ensure children are attending all remote lessons.
If anyone, like the PP above, does not have enough devices for all children to be online at the same time, then school needs to know. Don't just dodge the phone calls, schools aren't mind readers and can't be expected to know your home set-up. Most schools I know have already done home IT audits where either you or your child (depending on age) would have completed a questionnaire about what tech is available at home, but not all have and yours might have no idea if you have 3 laptops or none. If you're struggling with IT for all children do talk to school as they may be able to offer a laptop loan, if you're lucky.
This is NOT like the March lockdown when education in England Wales was suspended and we were all meant to be baking and bike riding. Education is still taking place, it's just moved online, and attendance is still expected. It's a long, hard slog this time for all concerned and parents need to work with schools rather than against.