Twitter has blocked URLs from Direct Messages (digitaltrends.com)

I'm sorry but I find really stupid to see this message:

"This request looks like it might be automated. To protect our users from spam and other malicious activity, we can't complete this action right now. Please try again later."

And find there's no way to prove I'm a human. Is that hard to add a captcha?

You also can't reply to a DM with a URL in the message.

I thought only followers can send DMs to each other, so I am not certain this is much of an anti-spam technique.

It's probably worth noting this is from October so not related to the sending DMs without permission issue making the rounds this weekend.