I've been using ComfyUI to do fine background and watermark removal. Might take a look into that as an alternative. Run Flux.2 Klein or Comfyui's own workflow.

Key point, saves a bunch of time. Copy, paste, click button, done in three seconds. The app is also just there, preinstalled. It's great precisely because it doesn't require "looking into" anything. Yes, there's a bunch of other apps and services, but that's all besides that point. It also works pretty much on any pc made in past decade and half without crazy gpu/vram requirements for a relatively miniscule task.