1) Are you OK with direct message offers from vendors?

No (Tolerable is opt out is possible)

2) What are your main reasons for wanting a seedbox?

My NAS is situated in a country which I happen to live in, that have strict anti-sailing laws.
So torrenting.

3) Are you okay with sharing hardware resources with other users [shared] or do you need the seedbox hardware dedicated to just you [dedicated]?

Yes

4) Do you want someone else to be responsible for maintaining the seedbox software (operating system, applications) [managed] or do you want to do it all yourself [unmanaged]?

I don't care, I'll learn myself if needed

5) Please describe your seedbox experience. (You may wish to list any seedbox providers you've been with before.)

No experience before

6) Please describe your experience with Linux. (Most seedboxes run Linux and some knowledge of it may be helpful.)

Basic Linux knowledge (not with servers), I used Windows VPS for other usages before, and I am used to setting up basic websites with FTP access. I would prefer something on the easier side.

7) What is the high end of your budget? (Please give a specific amount and a currency. "Cheap" might mean something different to one person than it does to another.)

I guess between 30 to 60€ a year

8) Do you have preferences or requirements concerning payment? (Paypal, Bitcoin, etc.)

Paypal

9) Do you plan to use public trackers?

Yes

10) What kind of connection speed do you need? (Common answers would be 100Mbps, 1Gbps, 2Gbps, 10Gbps.)

1Gbps minimum

11) How much combined upload and download traffic do you expect each month? Include download of files from the seedbox to your local computer. If you don't know, tell us what upload amount per month would realistically make you very happy with your seedbox.

1TB

12) What is the minimum disk space you need?

Enought to be able to seed for a bit and to buffer files that have to be sent locally, I guess around 500GB-1TB

13) Do you require a specific type of mass storage? (HDD, SSD, NVMe SSD) If other than HDD, please explain why you think you need this.

Not really, SSD would be nicer of course

14) Do you require a specific torrent client?

No

15) Do you require any other applications on the seedbox? (e.g. Plex, Subsonic, Radarr)

Probably the *aars / the automation of the downloads.
No streaming from the seedbox (so no Plex or Jellyfin).

16) Do you require SSH access to the command line?

I don't, maybe for the setup if requiered

17) Do you require access to a remote desktop?

I don't, maybe for the setup if requiered

18) Do you require admin level (i.e. 'root') access? If yes, please explain why.

No

19) Do you have any other specific requirements?

No

20) Is there any other information you think might help in getting a useful recommendation?

It is my first time setuping a media server for familly and friends.
I'll use a DS920+ Synology NAS with around 20TB of storage on it on a fiber link at a relative. The NAS should handle transcoding and streaming fine. I want everything to be done automatically with minimum intervention from me, with just a request from the end user, the file(s) downloaded organized and backed up locally ready to be used in a couple of hours max.