If it was a genuine question, the genuine answer is it's the provider that democratised streamlined ACME certificate verification and made it for free

No account, no payment, a single bash command or a certbot that runs regularly and you have your own globally recognised certificate

Historically, providers used to make the most frictions so that they could justify absolutely crazy fees for signing any certificates. It doesn't goes down well in DevOps, it doesn't work with indies who don't have 3 to 4 digits figures to blow in httpS, everyone including organisations ended up making certificates authorities of their own to sign stuff... and let's encrypt was successful at making certificates easy, free and actually secure