The possibilities offered by Tombola are far superior than the rest alternatives existing today... so i would not call another simple lotto/gambling project as real "competitor" in the strict term of the word... as Tombola got something fresh, different and the most important: transparent and useful! in last instance, it is all about the case of use!
Indeed, Tombola is way different from other gambling project. Its competitor is outdated and less function than tombola. Most imortan is fees like gas they dont need gas on tombola so it is accessible to use.