What you are describing is alternative frontend, not a piracy site. Alternative frontends hold no unauthorized copy of content. They can potentially infringe copyright by claiming authorship of content. That would make them fall under piracy from the legal standpoint but I never seen such sites.
Piracy normally implies content is physically located on site’s servers. This requires significant infrastructure for storage and content delivery.
What you are describing is alternative frontend, not a piracy site. Alternative frontends hold no unauthorized copy of content. They can potentially infringe copyright by claiming authorship of content. That would make them fall under piracy from the legal standpoint but I never seen such sites.
Piracy normally implies content is physically located on site’s servers. This requires significant infrastructure for storage and content delivery.
Whether they are or not doesnt matter, everyone calls them so and it’s almost certainly the kind of sites the OP had in mind.