People have invested lots of time and money setting up these sites. This would drive away all serious players. Although backgammon seems a relatively trivial game, top players generally defeat lesser lights, especially over the course of long matches. This is absolute proof that backgammon is a game of skill. Beginners marvel at the immense luck of good players, not realising that their plays maximise the probability of good numbers coming up, and minimise damage from bad rolls.
Experts lay traps for the unwary, giving weak players the opportunity to make bad plays.
A beginner, not perceiving the significance of the moves, will believe that the better player is unreasonably lucky. Over time all combinations and sequences of dice will occur. Any given sequence is as unlikely as any other. My rating is volatile, varying by 100 or more points at a time. After playing a beautifully calculated tactical game, you need to bring 2 men home, with 3 of the opponent's men trapped on your one point.