I think s/he wants something that the users hosts together. Ads can be blocked, reduces the value of your service and do not pay enough to cover infra cost unl

I think s/he wants something that the users hosts together. Ads can be blocked, reduces the value of your service and do not pay enough to cover infra cost unless you have many users. In comparison - the resources needed to run a desktop app is 100% provided by the user.