On the other hand. Mail delivery services like Mailchimp and Sendgrid often see blocks of their IP address spaces ending up in IP blacklists because their services are prone to temporary abuse by bad actors. So even if you get a personal IP address on the service it might be blocked. At that point you still need to take manual action. Some spam list distributors are borderline extortive in nature and will demand a fee to remove you from such a blacklist, and might not even consider removing you if you are using a specific third party SMTP relay service.

I guess mail delivery is just hard regardless of whether you are hosting it yourself or using a commercial relay service.