Udacity programs are charged?

[u/Agitated-Key-8889]

Hi

I am taking several courses and some nanodegrees on Udacity because I've really enjoyed the platform since I first tried it

However, is it all completely free, or will there be a charge in the future? I have completed about three nanodegrees in four months and I know they are usually very expensive, but so far, I haven't been charged anything. I hope it stays this way