> isn't it deceitful to be allowed to advertise an online masters as a regular one?

You may think so. Luckily the validity of a degree isn't for you to decide!

> Doesn't that do disservice to those who went ahead and got a regular one?

Is it a master's degree? If yes, why is it a disservice? But also to be clear I believe you're a troll on a troll account so don't respond, I don't care.

> I myself don't have a masters from NYU.

Sounds like you have an in-person masters and are upset other people got a better deal. Which goes back to my original point, stop being upset and don't count other people's money.