How to know which animation software an artist is using

[B00Bmaster]

Ik stupid question but some artist really make world class 3d animations stills / videos so is there any way to know what software they are using to produce
some e.g. I would like to know are
rro.lled
jackerman
naughty brain comics
WCK3D
Mr.FOXX
Pegasus Smith
Morpheuscuk