Sell the privacy of your guests
They signed an EULA before they joined. The fact that none of them read the part where they have given their souls and privacy to the company does not matter.
So, go on. Sell their data to governments. Make a reality show out of their lives (and filter out any incoming email that would let them know about that). Sell their most intimate moments online.
You can even train an AI to learn how to mimic and impersonate your clients to the most minute detail. Then you sell some "private virtual reality time" with such AI's on the internet, for those above age 21 and who live in countries who have no laws against adult content. If you have celebrities among your clients you can put whatever price tag you want on that... Experience.
Rent the bodies of new clients
Ok, so most clients' bodies are dead. But fresh new clients may be young and healthy and, again, EULA. There was a part where they have given prior consent to usage of their bodies for various purposes, including drug research, modeling, and sexual activies. A corporate team of doctors will keep them safe from STD's.
Freemium uploaded consciousness
Do like many pay-to-win mobile games do. Once a day you give them the "your virtual existence will be made unavailable for sixteen hours. Buy some stars from the online shop to continue playing now!" The ones who are broke will get a job somehow, to keep going 24/7 - if they have access to email, they can work. See the next idea for a way in which they could make some money.
Have your online denizens work for you
You can start a business model where it is FREE to upload and keep your mind online, as long as they do some mechanical turk work for you. You can then sell that mech-turk job to other companies. You will be raking in new customers, and each one will bring more profit to you.
Use some server time for harvesting crypto coins
Introduce something in the virtual world that everybody would want (say, cute clothing for their avatars), and that can only be obtained with some "in-game" currency. In order to get that virtual money, they must cede some of the server time that would be allocated to them back to the company. You can then use that server time to harvest some dogecoin (yes, this is a thing), or whatever cryptocurrency suits your taste better.
