It's also using Cloudflare and set up to block Digitalocean ip's outright from browsing anything at congress.gov and its subdomains.
Sorry, why Digitalocean ip's? Anti-bots and DDOS? And, how do you even find out about this?
I don't know why, probably because DO is known to be cheap and originates a lot of spam. It's just super annoying because I use it as a cheap fairly reliable wireguard VPN since my ISP's seem to reset/kill my ssh connections otherwise.