If a font shares a specific commonality with another font, it's an Arnold Hotel Font™.
Use the following examples below to find the commonality. Clarification: This is asking specifically about the typeface being used, not the name of the typeface/letters contained within.
And, if you want to analyze, here is a CSV version:
Arnold Hotel Font™, Non-Arnold Hotel Font™ GARAMOND,CALIBRI ANTONIO,VERDANA UNIVERS,CAMBRIA GOTHAM,BODONI BEMBO,GILL SANS AVENIR,LUCIDA CHAMPION,PERPETUA FORMATA,ROCKWELL GEORGIA,TAHOMA VITESSE,ONYX CALIFORNIAN,PAPYRUS
Note: There are other Arnold Hotel Fonts™ than the ones on the list.
Brownie birth Home
The person in charge, alternatively, the place they're in charge of:
For @hdsdv (and anyone else following along at home)
For your spoiler block #1, take a look at the second piece of documentation(s) you mentioned.
For your spoiler block #2: Who are some famous/well-known Arnolds?
For your spoiler block #3: refer back to my hint for your spoiler block #1