From your error message it looks like your IP is blacklisted by Cloudflare. Are you maybe using a VPN? Some VPNs are blocked by Cloudflare/require a captcha because they were used by spammers before. Large parts of the internet are using Cloudflare though, so it would be strange if you had issues only on TravelFeed.
Steemitimages has been a reliable and free solution for image delivery and made our life much easier, but in the medium-term we want to move to our own image CDN. But the two solutions are either using a Cloud Service like Amazon S3 which is expensive or setting up image hosting on our server which is more work and less fault tolerant and both would require quite a lot of our limited resources to set up.
Another option would be to move to the hive.blog imagehoster for now. When Hive launched, the hive.blog imagehoster was very unstable and we didn't want to put more load onto it, but that seems to have improved now. When we made the decision to become an independent platform that supports cross-posting to several platforms, starting with Hive and Steem, some folks at Hive took offence that we are not migrating to Hive exclusively, while nobody on Steem seemed to have a problem with that, so we are not sure if they would let us use the hive.blog imagehoster. So for now we are sticking with Steemitimages.