I don’t think using google colab and torrent leecher deployed to heroku for downloading things from private trackers is a good idea.
Apps deployed to Heroku can only live for 24 hours and then they reset everything, google colab also has a time limit as well. So, it’s impossible to seed torrent for 3 days with those.
The best solution is using seedbox. But you’re likely to need to pay for having a seedbox. If you want, I can give you one of my seedbox. I have a 100GB plan seedbox that will be expired on July. I don’t use it frequently since using Heroku is enough for me (I don’t have any private tracker account, I only use the public one). But if you want to move the files from this seedbox to team drive, you need to use Rclonelab with google colab.