When downloading any channel or subscribed content the message appears.
Screenshot.

The same error happens when trying to load any video.
Seconding this, I'm also experiencing the same issue. As a first time user of Freetube..
Hey everyone, please read this blog post that was sent out to better understand what these errors are along with our plans for solutions.
I'll keep this issue up until it's fixed, but know that we're looking into solutions and there are already a few things that can be done to prevent this.
Thanks for the update. I had just imported 600+ subscriptions so that's definitely the reason, certainly makes sense lol.
Fetching the feed via RSS worked.
Thanks.
I can't even import my subscriptions due to the 429 error
Most helpful comment
Hey everyone, please read this blog post that was sent out to better understand what these errors are along with our plans for solutions.
I'll keep this issue up until it's fixed, but know that we're looking into solutions and there are already a few things that can be done to prevent this.