Those are pretty low limits but without knowing your actual bandwidth, or if you're dealing with data caps, can't say if you're being rude.. but you're probably fine. In the end you contribute what you can, and seeding is still better than not seeding :)
My own rule of thumb, if my running p2p software needs to have bandwidth limits then I aim for at least 1 Mbit/s (122 KiB/s) to contribute to the network. But that assumes you actually have 1+ Mbit/s internet upload and no data caps, people around the world have different available speeds.
Might be helpful too https://duckduckgo.com/?q=50+kibibyte+to+megabit
Earlier post https://lemmy.world/post/43496203