WP Role "Subscriber" means automatically LEVEL #0?

Maybe my question is too obvious, but not for me.
If somebody registers to the site e.g. from woo commerce, or just open registration, the WP role is “subscriber”.
Is it automatically becomes LEVEL #0?
Thx for help

Actually this was a silly question, as I researched the s2Member, I found at Open Registration, that

Whenever a visitor registers without paying, they’ll automatically become a Free Subscriber at Level #0