None function with anonymity by default and you can't sell or even transfer most of these memberships.
I wonder if part of the divide on the "utility" of NFTs involves "internet native" culture (assuming the reality of pseudonyms without need to pierce the veil and use a real name).
The token is the mag-key-card that opens the doors to your local gymnasium.
Or a database entry that gets checked when you show your personal ID to get into the flight club lounge you bought lifetime access to via Amex club
Or any kind of website or info-product you bought a membership for, where the token is your email address + password
etc.