Same reason no one uses Wikipedia anymore - it's become a theifdom to the editors who have staked a claim on "their" territory and woe betide anyone who wants to contribute without paying prior deference to the emperor - you contributions will be deleted/removed/rolled-back instantly (often automated) for the flimsiest of reasons (if any reason is given at all).

Or my favourite entire IP ranges or whole ISPs blocked because eighteen years ago someone used a sock puppet account from their and there is no recourse because the High Doge has decreed it from their throne in Moderator Palazzo - you can appeal but the lord chief's decision is FINAL, and they're all too busy infighting and empire building to care about such trivia as users anyway