I think you are asking if Wix has pricing discounts for bulk websites (like SiteJet Studio builder has) for agencies/freelancers that build for clients (where their prices are as low as $5 per month). They do not. Each website gets its own hosting, and the more features you want —- the higher the price.
Wix offers free domain for 1 yr, then you have to renew domain at regular price. It is separate from the hosting packages.
Wix is a reseller of Google Workspace, so you get limited features than you would get if you connected everything directly cia Google.