FeedSee will accept your site's RSS feed immediately. No questions asked. I mean, no registration is required. Not even your email is asked; just the feed URL only.
But be prepared to use your general knowledge while submitting. Their system will ask you to answer a question. This is in place of the usual 'Captcha'.
You can also search for feeds for a set of keywords.
All bloggers who are blogging about ways to earn online by blogging should immediately submit their blog's RSS feed URL.
I just searched their database of feeds for this keyword: "Earn money by blogging"
The result is just one feed URL and it has nothing related to the topic searched.
I searched for 'Blog Promotion'. Again nothing.
They have a database of tags. I found the tag, 'blogging' and it yielded 62 feed URLs.
FeedSee is a human edited RSS feed directory.