Generally the reason an attacker would do those things is because their hijacks will last much longer due to lack of an abuse department and victims having to c

Generally the reason an attacker would do those things is because their hijacks will last much longer due to lack of an abuse department and victims having to contact upstreams. Shorter ASPath, planning which Tier 1/2 is the best to hijack from, and lack of LOA requirement or RPKI. If an attacker wants to do this - they don't want to "just" cause damage. This is a limited opportunity. They want to do it right, and that takes planning. I do agree that your idea is possible, but I don't think it captures the full severity of the issue.