They implied it used a GCP account. It would require to give Google personal information, a phone number, and automatic payment permission. And Google not disable your account because your spouse uploaded images for your child's doctor.
ZeroSSL should also be drop in
ZeroSSL advertised for free 3 certificates with no multiple names or wild cards. The next plan was $180 yearly.
Their docs say unlimited free and wildcards are supported with ACME. Does require EAB tho