In many cases individuals can eat very large amounts without getting fat.
However, while muscles can burn glucose (including glucose resulting from having eaten a starch) they cannot burn fructose.
Fructose intake can act towards increasing instinctive drive to eat more, whereas glucose intake is correctly recognized as needed calories having been taken in, thus reducing later caloric intake. (This has to do with how fructose is metabolized in the hypothalamus.)
High fructose intake is also strongly correlated with incidences of metabolic disorder, diabetes, and obesity, and there are known mechanisms of how high frucose intake affects gene expression in these directions.
There is no good reason to, on purpose, have high fructose intake, including from sucrose, corn syrup, high fructose corn syrup, or high caloric intake of sweet juices.
25 g/day is fine.
To bulk in terms of muscle gain, protein, glucose, including by starches or cyclic dextrins, and fats are all far superior choices.