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I think this depends on your tracker. For digitalcore, they expect you to be seeding for X amount of time but after that you’re good. I don’t think ratio is super important for them but it may be others.
They also have an IRC that increases your freeleech as long as you idle in it. When I started I accidentally did a few Hit-and-runs and my freeleech was low so I just logged in with a client I set up to autostart with my OS, which sorted it quickly enough.
Once you get a few torrents permanently seeding (even if it’s slow!) you build up enough freeleech to not ever have to worry - it’s self sustaining for me now.
Because people will do the work for them, so why enforce their TOS when they can just say YMMV and have absolutely zero liability if someone’s extension sells your corporate code to the dark web