I agree with floyd and David.
The typical music library model has you submit three songs and wait 3-4 months to see if one or more is accepted. They accept around 7-8% of submissions. If accepted you are then offered a non-exclusive contract for several years after which they have a right to renew. After that the company pitches the song for you. We are signed to Crucial Music under that model. Crucial states that if you are offered a contract you will get placements (we hope that’s true as they are pitching our song to some big players)
Songtradr has a unique model in that you can upload all the songs you choose and then submit then for “music wanted” listings. Again, the licenses are non-exclusive but unlike the other companies you do not sign an actual contract with them.
Regardless, none of the libraries that I know peruse the billions of songs on the net looking for songs to pitch.
All meaning that if I got a notice seeking to license a song from some entity I knew nothing of I’d immediately think scam.
You are certainly taking the right approach by not jumping righ in.
Best to you!
Bud