Because you're asking it to do the one part of link building that's a straight ToS violation, mass account creation, then acting surprised the robot lawyer says no lol.
Flip it. Claude's genuinely good at the boring 80%: prospect lists, finding unlinked brand mentions, drafting outreach that doesn't smell like outreach, boiling a competitor's link profile down to the 20 links you can actually replicate. The placing stays human.
Ask it to find the 50 pages in your niche worth a real email instead of asking it to spam profiles. You'll get more links AND keep your accounts.