Roobet organizes an art contest which means it is free from categories, the most important thing is the work of art itself. whether it's the category of handicrafts or digital art, it's important for participants to be creative in making works according to their abilities.
if Roobet ran a contest in one category it would not be interesting. because as I said that everyone has different abilities and skills. for example, you have skills in digital art but I have skills in crafts and Roobet is running a contest for the crafts category, are you disappointed that you can't enter the contest?
all hope of Roobet is participants with high enthusiasm to enter the contest and attract a lot of people out there trying to get into this area of Roobet.
so there is no need to provide category boundaries. IMO