what is free upgrade? How much you currently pay now and how much they offering you for monthly fees? if you mean free upgrade as in free installation, ya there's a promo (usually not mentioned out loud) as such.

I doubt existing Copper sockets can be used.

If it's 30mbps it has to be fiber.

I'd assume the fiber infra is probably a common one that can share between different ISPs. Centralised infra for the apartment. (anyone else do correct me if I'm wrong)