Google and Microsoft used to be an alternate way to sign in to an account you had already created with a password. Now they're a way to create the account in the first place.
On the sign-up page, accept the terms and choose Sign up with Google or Sign up with Microsoft. You authenticate with that provider and come straight back with your account made — never choosing a DevStride password at all.
Email-and-password sign-up is completely unchanged, and so is signing in — with a password, with a social provider, or through enterprise SSO.