All the charger networks have solved this. Just choose a network (Chargepoint, Semaconnect, etc.), put in a 2- or 4-connection charger, and each EV owner pays for each charge with an RFID card or their phone. There are also online services for scheduling and paying for use of private (not-smart) chargers (evmatch.com), and others that specialize in your exact problem (multiple chargers in shared dwellings): evercharge.net

In a condo building, each parking space is deeded to the owner as a limited common element for the exclusive use of the owner. The charger in the parking space is owned by the owner of the parking space and the electrical connection runs to a utility closet that the electrical utility controls.

In a new building, you just design the electrical system so this is a non-issue. In an existing building, it's not so simple. Any state that has a lot of condos is going to have 100+ years of condominium laws that govern the ownership and usage of space in a condominium. You can't force someone to share their space and you can't authorize someone to enter someone else's space.

Condo associations that want to solve this can. It isn't a technical problem and it won't slow down EV adoption very much. It is kind of like adding satellite TV and plenty of HOAs have figured that one out despite not having it wired into the building. Yes, specific organizations will be slower than others, but as the demand ramps up more and more people will want this solved in their own HOA and they'll start getting it done like dominoes.

People on our condo board have owned Teslas for years. We are a building that is out in front of it. Coax cable doesn't carry 240V power. This isn't something you can hand-wave away.

The why isn't the board voting for an easement for overhead distribution and a single junction off the service connect to power the charger network?