I believe you're referring to 'Guardians of the Galaxy Vol 3 2023 2160p WEB-DL DDP5 1 Atmos HDR DV HEVC-CMRG'
The HDR DV part of the title denotes that the file is "High Dynamic Range + Dolby Vision". The reason you're seeing the pink, or sometimes green, filter is because of the Dolby Vision HDR layer on this file.
This file is sourced from Disney+ and if you had a DV supported display, they would serve this version of the file for you. Otherwise, they would serve a SDR, or Standard Dynamic Range, version of the same movie for displays that don't support DV or has it disabled. I recommend that if you're grabbing 2160p files, you take care to see whether you're grabbing a HDR version.
In your case, I would almost always go with non-HDR and non-DV, sometimes it could be both, sometimes it could be either one. Ideally, grab a release that doesn't included both of those terms and you should have the SDR version. 1080p can also have HDR, but very rarely DV so you only really need to care about this when it's 4k
Don't think about the speeds advertised by providers, you'll never come close to them. You seem to require a media server, so give more importance to storage.
From my research comparing HostingBy, SeedHost and Ultra.cc - HostingBy has the highest €/TB rate except for the 1TB box which is ironically the highest €/TB rate
Here's the Google Sheet if you're interested Ignore the remarks and INR part, I'm Indian so wanted to see what I would end up paying
I will add on more providers at some point, but these 3 are the big names with decent prices and support.
As for your other problem of app selection, I don't think you'll find any of those in most providers natively (except for Transmission). You can request them, but its not a quick process. Instead of that, try installing them yourself. Even without root, it shouldn't be impossible, the only thing that may be annoying is you may not be able to setup reverse proxy so you'll need to access those services with http://ip:port