Custom user agents. Cloak yourself as an instance that is trusted, and scrape undiscovered. Combine with some proxies to truly blend in.
Monitor an uncooperative instance automatically; fediEngine will automatically sit on the public streams of instances they peer with and import matching statuses.
"pissed everyone off in literally record time" - Recommended by 10 out of 10 people who, for some sad reason, have a dedicated column up to watch #fediblock.