Why it works like that

No more fight for me, i’ll just cancel my subscription, i did a lot of efforts, but thats not even worth.

Hi (or goodbye !?) ​@thoma.s !

In this case, Deezer sent a generic automated response (a template) used to filter the thousands of suggestions they receive daily. In this context, the word "maybe" usually means that your idea has been added to their database, but the automated system cannot make any concrete promises.
Large platforms rarely make promises during initial contact, due to issues like copyright, technical limitations, or development roadmaps that are already set months in advance.

If you want your idea to actually be seen by a human team (as well as other users who might support it), I suggest the following step:
Post your idea on the Deezer Community forum. Deezer has an official community (the Deezer Community) with a section titled "Got an Idea?".
Users there can vote on suggestions. If an idea gathers enough votes, Deezer’s product managers are required to formally review it and update its status to "Under Consideration" or "In Development."

Also some of your ideas might have been suggested by others in the past, so you could vote for them there.