Realistically an all-in-one service like the AOL of the 90s for the entire Commander X16 user base could be hosted from a Raspberry Pi. Loads of we Linux folks could slap that type service together with our eyes closed, especially if it's done with simple php and html pages. And, even if there were a million X16s on the system a day, even the worst virtual machine hosting service would be able to handle it, simply due to how small the data sizes would be for X16 content.
I'm no 8 Bit genius, but it seems to me that the VERA has the video capabilities to render reasonably sized images quickly and the 8MHz 65c02 can process text efficiently, so I imagine that a stock 512KB X16 could run an AOL-like "web browser" that combines...
Newspaper style layouts for user created blogs/sites
Instant messenger chat
Forum (perhaps a client for this forum's SQL database)
A client for this site's software hosting service
A blog topic directory with a search engine
Given the way of the real world, with web connected pocket computers in everyone's hands, something like this is completely unnecessary, but in that respect, so is the Commander X16 itself! The "why" really is, "because we can", especially given how few resources are required and how much expertise/software there is to benefit from.
Would it be worth making this for the 50 people who will own an X16? Probably not, but it would be neat.