Insead of showing an error, the forum should say, what's wrong like: "Too many posts in last x minutes"... That would be nice and helpful. Be friendly to your users.
See also https://community.spotify.com/t5/Closed-Ideas/All-Platforms-Browse-Get-the-forum-working/idc-p/45537...
Thanks for your feedback - we appreciate it!
If you would like to submit a new idea about this, you can create one in the Ideas Exchange here and get others to vote for it. If it garners enough votes, then Spotify might consider implementing it!
Hope that helps. Let us know if you have any other questions or feedback.