Is it possible to migrate or redirect a free Cloudflare-enabled subdomain to a custom domain later?

Yes, it is generally possible. For services like Cloudflare Workers or Pages, you can easily configure your project to use a custom domain instead of or in addition to the free `*.workers.dev` subdomain. This usually involves adding a CNAME or A record for your custom domain in Cloudflare's DNS settings and linking it within your project's configuration.