Some of the URLs in the list are invalid and give DNS errors.

[ananya-ky]

For example, DNS look-up fails for https://akamai.net/
Lots of the URLs in the list give out similar errors.

[mschfh]

The Cloudflare Radar and Cisco Umbrella lists include infrastructure domains.
For a list with only websites, consider creating a custom list using only CrUX/Majestic inputs, or enable the Only include domains included in the Chrome User Experience Report option.