

It massively depends on the country - it’s probably fine in Southern and Eastern Europe but not for example in Germany were if I’m not mistaken copyright violation is even part of Criminal Law rather than Civil Law as in pretty much the rest of the World.
Personally ever since I lived in the UK - which has the most insane levels of civil society surveillance in Europe, including of Internet usage - I got into the habit of doing pretty much everything behind a VPN, which also helps with peace of mind for the whole torreting thing no matter which country I’m living in at the moment, plus I pay 5 euros a month for the VPN which is less than a single streaming service, so in a way it pays itself (it’s funny how piracy compensates for the costs of protecting myself from dragnet surveillance).
You can keep on seeding after downloading and your torrenting program will still manage to upload to any member of the swarm for that torrent that it connected to (even if only to check their status) during the download phase.
This should be enough to get you consistently above a 1:1 upload to download ratio for any popular public torrents, though for those with very few leechers you might never get there.
The lack of port forwarding is only a problem for remote machines your program has not connected to during the current session for a torrent (i.e. not yet seen machines that try to connect to your client), which means you can’t seed at all in a purely for seeding session or upload to machines that joined the swarm after your download was done in a mixed session.
If your pattern of usage is that of mainly a downloader of public torrents who tries to give back to the communy at least as much as they took and whose not mainly into obscure stuff, it works fine.