Here at TG we keep our topics about sponsors, and since they do not sponsor here that is why you won't read much about them.
Not really--and that, IMO, is a good thing.
I say not really because there's at least a few non-sponsor string makers that get talked about on here pretty regularly, one who's name isn't even allowed to be posted. He probably gets more advertising here than any other non-sponsor. Never saw anyone get chastised over it.
I say it's a good thing because in spite of the above the good outweighs the bad--in my opinion anyway. Someone just getting started out may have their heart and soul and every spare dime invested, and don't even know yet if they really want to have a business. Forcing them to sign up/pay up right away, or black-balling them because they don't, won't help the sport any.
Discussing everyone could help that person get their feet on the ground and result in a new sponsor...or, if they aren't all they are cracked up to be, it could keep someone here from loosing money on them.
Freeloaders are going to freeload. No way around it. At least when you can discuss different products, word gets around.
I feel at least most of us (sponsors) here are comfortable and confident enough with their reputation and product that talking about someone you never heard of isn't going to worry them too much.
Shoot...I've got two videos showing folks how I make strings, even plans for the same board and stretcher I use. I'll tell you what my favorite string material and serving is, and why, and where to get it. I don't have any secrets or "proprietary measures". When I used to set up at tournaments I'd teach anyone who wanted to sit by me how to make a string.
It's worked for me for about 20 years now.