I used to seed in the old days, but I feel it has become more complicated now.
The primary issue (before eg.: CGNAT or port-opening issues) is it's become more and more often the case that I post-process what I download before use (rename / reencode music albums, reencode movies) so it makes little sense to keep the old files only for seeding. In theory a "seedbox" (those are the trendy thing this decade, right?) would help solve this, but I'm still rather new and have not found any FOSS, PII-free offerings in the market.