"...organisations like Deloitte"
Interesting that you mention them. Deloitte speaks of multiple networks for different groups:
"Our Diversity Networks connect people who share characteristics such as gender, race, religion, sexual orientation, disability, neurodiversity and parenting/caring responsibilities, creating a welcoming, inclusive environment – one where creativity and diversity thrive."
It turns out that there are 13 different networks covering people with different shared charactersitics:
"Deloitte’s thirteen Diversity Networks connect people who share characteristics such as gender, race, religion, sexual orientation, disability, neurodiversity and parenting / caring responsibilities."
https://www.discoverdeloitte.co.uk/articles/Our-Diversity-Networks
For example, one of these 13 is the Women's Network, another is the black network, another is the LGBT network and so on.
Each network is for people that share the same protected characteristic.