Depends on which plan and provider you go thru. I've been with mine for quite a few years, pay $7.62/month. I get 2TB of storage, 4TB of traffic (if you use ftp/sftp to download/stream your files, it doesn't count against that, so mine goes all to seeding). Download speed is unlimited, upload speed is 50000 Mbps.
It's not hard at all, you have a control panel where you can one-click install your choice of torrent app and web client, then you just use web client (which looks identical to the desktop app, at least in my situation with rtorrent/rutorrent). Other apps available on my plan for one-click install are: Airsonic Advanced, Audiobookshelf, Autobrr, Bazarr, Deluge, Doplarr, Filebrowser, FlareSolverr, Jackett, JDownloader2, Jellyseerr, LazyLibrarian, Lidarr, MariaDB, Medusa, Mylar3, Nextcloud, NZBGet, NZBHydra2, Ombi, Overseerr, Prowlarr, pyLoad-ng, qBittorrent, Radarr, Radarr2, Readarr, Resilio Sync, SABnzbd, SickChill, Sonarr, Sonarr2, Syncthing, Tautulli, The Lounge, Transmission, WireGuard, ZNC. If you want to run Plex, Jellyfin or Emby on the seedbox you'll have to get one of the higher tier plans. I used to download movies/tv shows over sftp and used to run plex on my home network, but now I just point VLC to SFTP path of the movie/tv show I wanna watch and it streams flawlessly (home connection is 300/10).
Feel free to DM me if you'd like more details about who I use.

Depends on how much you are willing to pay for size vs speed vs bandwidth.
Can become more costly than simply a VPN and a HDD very quick if you want to get into the long term seeding but also getting new stuff.