They would not likely have an MFA or have been apprenticed in workshops. While they may have published some poetry in small magazines, mostly their poetry circulates among family and friends. Maybe they have put together a book of their poetry, paying the expenses themselves, may even have sold a few. While they may be serious poets in their spare time, poetry is not their career. Most of their time is spent making a living other ways.
Poetry comes from stolen moments.
While they may associate themselves with any or no school, they largely operate outside of the poetry establishment. They are marginal, wondering about themselves and their strange habit. Now they have broken out on the web for all to see. At least the other amateur poets might be interested in their peers. And it could be that the economics of poetry on the web may be compelling, even for the professionals.