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In the current century the popularity of e-cards slowly declined.
The novelty was gone.
People could share pictures and video’s on social media, etc.
But on a less happy note there are also a lot of draw backs on sending e-cards when you have to give a company email addresses of other people or when fishing mails can falsely claim someone send you a card if you click on a link……that will lead you to a malware site instead of a cute card.
If you still like sending e-cards, then please practice safe sending.
Do not trust any obscure company.

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The safest way of sending e-cards is to make the picture yourself and just attach it in the email.
And be careful to use blind carbon copy when using multiple recipients.

Sources:

• http://holidayinsights.com/moreholidays/November/electronicgreetingcard.htm
• https://en.wikipedia.org/wiki/E-card