Free speech is just part of it, it is freedom of expression. From google AI.
Article 10 rights, primarily from the European Convention on Human Rights (ECHR) and the UK's Human Rights Act, guarantee freedom of expression, protecting your right to hold opinions and share information and ideas freely through various mediums (speech, art, media) without government interference, though this right is qualified and can be limited for specific, legitimate reasons like national security or protecting others' rights. This right covers political views, art, and even unpopular ideas, ensuring a free press and protecting journalists' sources.
As a society we need to try to work out where to draw the line, but from my point of view I believe that my rights to take photos or videos, or to create art using whatever primitive (paint and canvas) or sophisticated (AI) medium(s) / tools I wish should be incredibly wide, and only be prevented at points like malicious porn which could be seen as real, CSAM, libel etc.
It is very difficult to know the best way forward, but if there's one thing the last 5 years have taught me it is that freedom of expression and speech are two of the most important things we have, and they should be restricted as little as possible.