Are feeds bad for duplicate content?

[cindyt-17038]

One of my clients has been invited to feature his blog posts here https://app.mindsettlers.com/. Here is an example of what his author page would look like: https://app.mindsettlers.com/author/6rs0WXbbqwqsgEO0sWuIQU.

I like that he would get the exposure however I am concerned about duplicate content with the feed. If he has a canonical tag on each blog post to itself, would that be sufficient for the search engines? Is there something else that could be done? Or should he decline?

Would love your thoughts! Thanks.
Cindy T.