ZeroSSL has unpaid plans (for non wildcards) that have a few advantages that LE doesn’t:

• No Ratelimits,
• A WebDashboard
• More ways to validate
• They have a RestAPI

And, first and foremost, they are European and it’s always good tk have an alternative ready.

But as said before, I totally missed the wildcard issue, as I haven’t touched these for a long time and recently had more to do with my public services (which get a ACME single domain cert via zeroSSL)