Long time lurker, first time poster here.
I am a civil litigation attorney in Arizona that mainly defends companies, so thought I would chime in with some basic advice (I will give the usual lawyerly warning that this does not constitute legal advice or the forming of an attorney-client relationship). I have not read through every single prior post, so apologize in advance if some or all of this information was already relayed.
I know it was mentioned that affordable insurance coverage is hard to come by, but I would check with specialized brokers for business defamation coverage. Lockton is the first that comes to mind, but there are others that should be able to help find available coverage and get you quotes. Insurance across the board right now is expensive, but you should definitely look into obtaining coverage. In the event something ever comes up your insurance carrier will retain a lawyer on your behalf and be responsible for any potential indemnity payment (settlement or judgment).
I would also look into the corporate formation of ASR. Is ASR an LLC, S Corp, partnership, or something else? Is ASR even incorporated? Assuming ASR is an LLC or correctly incorporated, does ASR have any collectible assets? Is ASR following good business practices of not comingling business and personal funds or property (separate bank accounts, separate credit cards, equipment owned by the company/not individual, etc). Making sure ASR is correctly incorporated and following good basic business practices will help protect assets in the event litigation does occur.
I would also recommend consulting with a lawyer in your area that handles defamation type cases to get advice on best practices moving forward. They should be able to explain the various laws and protections in place for reviews (CRFA, Anti-SLAPP, etc). The price will hopefully be outweighed by the peace of mind that you should get from consulting with a knowledgeable attorney.
Sorry you have to deal with this. You would think the negative press alone would be enough to dissuade companies from going after honest and independent reviewers, but apparently not.