Some areas may even rely on LTE.

1-3Mbps vs 30-50Mbps is quite a bit of difference.

It also depends on how oversold the links are. I could easily take guaranteed gigabit and sell it to 2 homes as "Up to 1Gbps". Or 5 homes. How many people would be using the full bandwidth 24/7 anyway. But it can also be far less reasonable. I can sell it as "Up to x" to as many as I want to. Sure, you may only be getting less than 100Mbps now, but if others stopped using the internet... It's still validly "Up to 1Gbps". Maybe you'll get it, one day, or night.

If you don't have an SLA, you'll just have to deal with it.