Regarding their tagline: “Easy file sharing from the command line”, this is also possible with Yandex Disk¹ (specifically, the Linux version here²). It also has less limitations than transfer.sh, specifically:

• 10 GB of space for free (with a 10 GB filesize limitation³) over transfer.sh’s 5 GB

• no file expiration date, unlike transfer.sh’s 14-day expiration

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¹ — https://disk.yandex.com/

² — https://repo.yandex.ru/yandex-disk/

³ — https://en.wikipedia.org/wiki/Comparison_of_file_hosting_ser...