Although "Oh By"[1] is not strictly a URL shortener it can be used as one quite nicely.
When used as a URL shortener, there are no cookies, no tracking, and ublock origin shows a nice big zero throughout. This is because the revenue model of Oh By is selling custom/vanity codes - not monetizing user data or advertising.
"If you're looking for a dead-simple URL shortener that respects your privacy and doesn't slow you down with ads or multi-megabyte interstitial pages, Oh By might be for you."[2]
[1] https://0x.co