According to the Melon's official website, ten artists are awarded bonsangs based on 80% digital performance and 20% fan voting. There is no judge vote in the criteria.
According to this prediction account, Taeyeon had the 6th highest amount of UL's on Melon this year, and the 9th highest amount of votes.
Similarly, Taeyeon was among the most successful artists on Melon in 2021 and 2017, but didn't receive a bonsang during those years as well.
Thoughts?