Calling these "Smart Cards" is misleading, as that is a very well-established term for something else (cards containing an embedded IC used for authorization) [1].
The role of "one link" to a page with links to accounts/profiles on other sites seems well-served by existing sites including LinkTree [2] and KeyBase [3].
Potential customers could already put a LinkTree URL + QR code on a business card; the website doesn't do a great job of explaining why NameKard is better (and I have less trust in its website remaining available).
[1]: https://en.wikipedia.org/wiki/Smart_card
[2]: https://linktr.ee
[3]: https://keybase.io
