data.world test

trying to perform this simple query:

SELECT (COUNT(DISTINCT ?s) as ?c) WHERE {
?s ?p ?o
}

to Data.World without authentication.

the URL:
https://query.data.world/s/f222hh4smp4iwi4uidtbegtb72usts
was obtained for the file aairc.ttl (from rfabbri/linked-open-social-data).

These queries return nothing:

curl --request GET \
  --url 'https://query.data.world/s/f222hh4smp4iwi4uidtbegtb72usts?query=SELECT%20(COUNT(DISTINCT%20%3Fs)%20as%20%3Fc)%20WHERE%20%7B%20%3Fs%20%3Fp%20%3Fo%20%7D'

curl --request GET \
  --url 'https://query.data.world/s/f222hh4smp4iwi4uidtbegtb72usts?query=SELECT%20(COUNT(DISTINCT%20%3Fs)%20as%20%3Fc)%20WHERE%20%7B%20%3Fs%20%3Fp%20%3Fo%20%7D' \
  --header "authorization: Bearer $AUTHTOKEN"

although this query does:

curl --request GET \
  --url 'https://api.data.world/v0/sparql/rfabbri/linked-open-social-data?query=SELECT%20(COUNT(DISTINCT%20%3Fs)%20as%20%3Fc)%20WHERE%20%7B%20%3Fs%20%3Fp%20%3Fo%20%7D' \
  --header "authorization: Bearer $AUTHTOKEN"