This answer from a while ago should still apply:
URL shorteners are very risky; if you can limit access to yourself and trusted people you could try to go ahead with one, however hosting a public URL shortener is definitely not a good idea, as someone will eventually abuse it, and you will be held responsible for it.
You may also wish to avoid using a free InfinityFree subdomain for it:
Please don’t post the same question in multiple places, especially when it has already been answered. Posting in a different topic won’t get you a different answer.