Sorry, I wasn't being precise. Lots of people use BGP for easy lifts, like internal policy routing inside data centers (I find this mystifying but whatever) or simply to advertise Anycast prefixes to upstreams. I was thing more about doing default-free global Internet routing with multiple peers.

I've used exabgp running on a small VM to inject 300,000 /32 routes to multiple peers. Not quite the size of the full v4 routing table, but not too far off either.

Were you taking a feed in? Or just publishing your own addresses?

just injecting routes. There are a bunch of looking glass implementations that use exabgp though.