With today's news of Letterboxd being acquired by an investment company, I got to wondering if I should start weaning my movie obsession off of there and onto something more open before the inevitable enshittification begins. I did a cursory search and found nothing promising, but figured the braintrust here might know something I don't!
Check out Soularr, pretty new, scripts to integrate slskd and lidarr, works great for me paired with Deezer downloading through arr-scripts.