If you've built something useful for a SaaS founder... + my discovery and question

Hello everyone,
recently I launched a catalog with resources and tools that can be useful for SaaS founders: https://www.saasgearbox.com . Items (or products) can be:

• some app or SaaS or API
• book
• course
• another catalog
• podcast
• blog
• youtube channel
• anything else.

I just started so no surprise there are just a small bunch of resources.

If you've built something useful for SaaS founders, can you please check the catalog and maybe you would like to your product (free but registration needed)?

But what I discovered was an unpleasant surprise.
My hypothesis was if I tweet about a resource I published the founder or author of this resource would at least like or even follow me on twitter. It didn't happen.
Another assumption was - if I tweet about a new resource its founder or author would be interested in claiming the resource to take full control over it (it's free). And it didn't happen either.
Just FYI: I always add a mention into a tweet (if an author/founder has a twitter account, usually they have) so they always should see in the notifications (if they look there :).
I understand the catalog doesn't look very appealing or valuable but nobody expresses any interest in it.
Can you help me to figure out what's wrong? I have several answers:

1. There is nothing wrong, I just should keep adding and tweeting. The quantity will become quality at some moment.
2. All or some hypotheses are wrong.
3. The way how I'm validating the hypotheses is wrong.
4. The catalog looks wrong or unclear or non-valuable.

Thanks all!