New arist-led gallery, similar to saatchi art, art finder, riseart etc

Hello all, I’m conducting research for an arts organisation about a new artist-led gallery they’re planning to introduce, I would love to hear about your experiences of online galleries such as Saatchi Art, Art Finder, Degree Art and also what you’d be looking for in a new artist led gallery, the galleries message, services we could offer etc. Look forward to hearing from you!
Andrew