This is not a restriction on what you can do on the internet - you may download as much information as you wish. Business accounts do not receive this discount for their employees. Plan D allows use of your own domain name. This plan is designed for very high volume commercial web sites. Commercial accounts may promote their company or products.
All accounts using domain names are commercial accounts.
Personal accounts are granted a free use of web space for personal use. Personal uses are generally pages about a person, friends, hobbies, family, etc. You may put your resume on a personal page. You may offer personal items for sale. The personal page MAY NOT be used to promote a company or products.