So I've been a fusion fiber customer with Sonic for many years. They have rolled out 10 GB in my neighborhood, which I was very excited about. I called to upgrade and have been informed it's available...for a one time $300 fee. Yet my neighbor across the street can sign up today, pay no additional fee and receive the same 10GB internet. Why is Sonic punishing loyal customers?
They're not "punishing" you. You already received a free install and equipment with your original service. If you want to upgrade to 10G, they'll have to roll a truck, install new equipment, and pay for the labor to do so.
Keep in mind that 10G will also allow you to downgrade to internet only if you don't need or use the phone line. In that case, all of the related taxes and fees for phone service go away (you'll end up at a flat $49.99) and the install will pay for itself in a year or so.