Here's a trace of some hand-drawn, stylized text.
Illustrator executes the trace quite nicely, but inevitably, there was some cleaning up to do.
If you look closely, you'll see some of the gaps are transparent, while others are painted white.
The transparent gaps are either literally deleted, or opacity reduced to 0%. This is preferred, but not always practical, because there are layers underneath. Actually, according to Adobe terminology, it's just a group on one layer, but you know what I mean; it's covering other stuff.