What I would like is a list of creators, bloggers, youtubers etc, who have a solid audience and are seeking to mention others. For example I make a google sheets tutorial youtube channel. Sometimes I make a video that I genuinely could be featured by others and reacted to, and discussed... but I don't have the list of those to reach out to. I'm building it myself. like you said, in a spreadsheet. But there's no earning credits or trading. Wouldn't mind going through a list of people who are interested in trading exposure.

I didn't even see that as a problem in 2015. Google's algorithm that devalued link exchanging went live in 2012, so I'm somewhat flabbergasted that people are still pursuing it for SEO.