I think this is mostly a US thing. Why use yearly salary? You’re not paid once a year, are you? Most likely once a month. Referencing monthly salary makes much more sense.
“I’m making 50k”. Great, now I have to guess - dollars? Monthly? Yearly? If yearly then what’s the monthly paycheck? Net? Gross?
As a freelance steadicam operator, my daily rate can vary between $2000 and $4000 per day (including my personal equipment rental). But I don’t work every day, far from it (especially during the current strikes) so a monthly rate is irrelevant. A yearly net revenue is a mettre measure.