Michigan doesn't have a specific auto-renewal law, but the CPA (no specific auto-renewal law) (Mich. Comp. Laws § 445.901) plus federal FTC rules protect your right to cancel.
Mich. Comp. Laws § 445.901
Penalties: Actual damages plus $250 minimum per violation
SubScrub automatically cites Mich. Comp. Laws § 445.901 and federal laws