Microwave is also affected by weather. They sometimes say that markets are slightly less efficient on rainy days. It’s a bit of a joke, but basically packet loss goes way up and they rely more on fiber links when microwave links are being shitty.
You make a contract with a company that does layer 3 ddos protection, you advertise a route including their AS on a subset of your prefixes and they route to you over a GRE tunnel.