When can a business skip a trademark registration?

Consult local CA or post it in CAI.

Trademark Registration is not a legal compliance i.e. it’s not mandatory. It is a way to get ownership on your mark and prevent unauthorized use of the same. Misusing or copying a famous mark can actually lead to loss of business and clients. If you do not want to save your mark or you are fine with its unauthorized use by some other party then you can easily skip trademark registration.

Further, please read upon the benefits of applying for registration of trademark at Know How Trademark Registration Can Impact Your Business