You don't have to!
It's encouraged - I do think having that external commitment is a good source of motivation - even if it's unknown faces that mostly won't acknowledge it, it tends to push you toward not disappointing people.
But some people in the past have found that counterproductive too, as they found themselves focusing too much on making something that'd look good on social media, and not enough on some longer features their games needed.
Bottom line - it's your decision, and probably depends a lot on your overall goals. But don't let pressure or fear of result make the decision for you :)