Instead of using MO to publicize conjectures, I think it is now more appropriate to use other platforms that more specifically caters to this need.
I immediately thought of SciLag upon seeing this Meta post.
From SciLag's introductory page:
SciLag is a free web-based platform that provides tools for mathematicians to collaboratively build a dynamic database of mathematical problems at research level.
The platform allows researchers to share, discover, and discuss open problems in their respective fields.
Our hope is to leverage the power of data to the benefits for the mathematical community by transforming Mathematicians’ visions outlined in their research articles into dynamic objects that can evolve through community's efforts.
SciLag is a free web-based platform that provides tools for mathematicians to collaboratively build a dynamic database of mathematical problems at research level.
The platform allows researchers to share, discover, and discuss open problems in their respective fields.
Our hope is to leverage the power of data to the benefits for the mathematical community by transforming Mathematicians’ visions outlined in their research articles into dynamic objects that can evolve through community's efforts.