Bareback is not for me (nor for most) but the WG in question states she does it openly, so she only attracts punters who either want BB or are happy to see her anyway.
Her not currently meeting because of Covid-19 still has a logic to it: if she BBs with a punter they both know the risk and any STI they may pass on to each other is only transmissible via sex. Although there are some antibiotic-resistant strains of some STIs going around, you don't pose a risk to all and sundry.
Covid-19 is entirely different, it can easily be passed on to anyone else unwittingly, and in the current pandemic, somewhere down the line your own case of it will quite possibly kill an innocent stranger. Plus it will add to the workload of NHS workers and put them in danger, and also take up a valuable critical care bed.