Some miscellaneous thoughts:
The freemium ad-supported model seems to be central to peertracks, so really anything that increases the ease and ROI for big advertisers to bring big $$$s to the site would be good. This includes, for example, selling or offering access to "big data" on the demographics and habits of curators and regular users... sophisticated, cutting-edge data analytics tools, making peertracks the advertising site of choice... detailed, tamper-proof (blockchain/trustless) analytics on the exact results of ad campaigns, etc., etc.
Is the "no audio-ads" requirement set in stone? Having as a default the ability to listen ad-free for "free" is going to be a great draw that distinguishes PeerTracks from many other streaming services. Still, I can't help but wonder if doing away with audio ads completely may be leaving a LOT of money on the table. What about giving listeners or curators the ability to earn a small # of tokens or credit by opting in to audio ads? That way, peertracks can tout itself as 100% free of audio ads for those who want it that way, but it can also monetize a ton of $$$ from listeners who don't mind audio ads.
Peertracks could take a cue from LinkedIn, which currently appears to have 3 major revenue streams: premium subscriptions, advertising revenues, and talent solutions (e.g., HR recruiting tools for headhunters and corporations). Having features for professional networking would make PeerTracks something of a one-stop destination. It could have premium subscription-based accounts that allow many different types of music industry professionals to connect to others via e-mail: artists, aspiring band-members, curators/talent scouts, DJs, recording studios, technicians, record producers, nightclub owners, music lawyers. This could be a worthwhile source of revenue for Peertracks in the short- to medium-term, even if the main goal is to gain tremendous user adoption of music streaming...