Zapier's color is orange so we picked orange-red as the default for fun. Probably should consider a plain red though too. Thanks for giving it a try!
Looks great otherwise! Awesome job. But yes if we dig into anything annotated, the most common color is always bright red.
Don't! Saying there's an "industry standard" for an arrow color on screenshots is crazy. Don't just rebuild what already exists; I love the branding aspect of it :)