this is literally veadotube but differently arranged
Did you actually use the software, mate? Sure, they have the same purpose and the same function, but both have decently different featuresets if you actually put them side by side (example, Veadotube lets you change states with keybinds and has a Sprout output, Gazo has window transparency and a "Scream" function, etcetera). Definitely more than just "Veadotube but differently arranged".
this software allows for bigger image files and also uses actual transparency so it doesn't have coloured outline around the images like veadotube does, so already for me that is a huge difference.
funnily enough multiple people can develop software for the same purpose but differently so people can have options! for example premiere pro and davinci resolve are two options for video editing. you'd think most people would know that