If one licences open source under a strong copyleft licence (say AGPL3) presumably one can open up later and issue under weaker licences (say MIT) if one chooses?

Presumably you can also sell access to it with a full commercial licence if one chooses?

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emersion 2 days ago | parent [-]

This works as long as you're the only copyright holder. If other developers contribute, weakening the license requires their approval.

	▲	fluoridation 2 days ago \| parent [-]
		It's also possible if contributors agree to waive rights to their contributions, thus having multiple contributors and a single rights holder.