Most things we purchase are not directly from a manufacturer, but from a reseller with exclusivity contracts from that manufacturer. Either they invented that item, or secure the contracts/license/whatever to sell the item. This is of course skewed by China selling copies of everything from the factory line on Alibaba etc. but in general it's kind of how our world works.
Most products you buy, you aren't so invested on the back end that you're researching those things, looking up LLCs owners before you purchase nails or a coffee mug or that bag of chips. Nobody is investigating supply lines for their contacts, exclusivity contracts on their air filters, etc.
I haven't looked enough into this to know, because idk what the big deal is in the first place, but is the 4mm filter patented by this company? If not......nobody is being stopped from finding a med device manufacturer already making other sized filters and working with them to create a competing 4mm filter product. If this product is so in demand, being gate kept, enough issues to warrant this kind of discussion/scrutiny over it.....someone could you know.....do something about it. Lol
The email thing was a misclick between CC and BCC. I work in marketing. More than likely literally just clicked the wrong button when adding the email list to send. Mistake? Sure. Is having your email address exposed any sort of risk to you? No not really, your email is everywhere already stolen on every black market list you can imagine. All of your passwords too. More than likely those lists include our home address, family members names, phone numbers. Look it up. I've found mine, scammers have literally all my info lmao none of your data is safe, private, or secure.
Blame the credit monitoring companies who complie all of this info on you against your consent, and then get "hacked" yearly and offer you a free year of monitoring service for your troubles. Lmaoooo
Point of that is again, so much worse is going on with companies you interact with daily. We just aren't obsessed/emotionally invested in their shit and just move on