I feel that I lucked out. My area code had a dialup BBS with 40 lines, on which they ran software to tunnel IPX.
On the client side you ran SIRDOOM, which then shelled out to Doom once the connection was setup.
Best part: it was all free.
I never got the background on why they did it, and why they never charged a dime. Maybe they had aspirations to be the next DWANGO?
Who knows... but I spent many a night fragging till I dropped.