"Several hundred other domains" is factually inaccurate. At most, there are ~40 other zones on the certificate (typically, far fewer).
The challenge here is IPv4 address space; we don't require SNI for paid plans -- cert will be returned even if server_name is omitted from the TLS ClientHello -- so we must assign these customers dedicated IP pools. We're actually in the progress of migrating all paid customers to their own certificates, so this issue will go away soon.
The challenge here is IPv4 address space; we don't require SNI for paid plans -- cert will be returned even if server_name is omitted from the TLS ClientHello -- so we must assign these customers dedicated IP pools. We're actually in the progress of migrating all paid customers to their own certificates, so this issue will go away soon.