Careers currently only have "Allows Remote" option and it is rather unclear. Some postings are marked "Allows Remote" but only allows work from home from time to time.
Many businesses now are remote based, meaning that there is no requirement to be in the office and sometimes there is no real office at all.
I suggest "Allows Remote" is used for businesses like this, while "Work From Home" is added only for businesses that allows occasional work from home options.
Another reason for this is that business that only allows "Work From Home" is bound to a geographical location and is not a fully remote or distributed company.