I really think this memory thing is overstated on Hacker News. This is not something that is hard to move at all. It's not a moat. I don't think most users even know memory exist outside of a single conversation.
I dislike that it has a memory.
It creeps me out when a past session poisons a current one.
It doesn't even change the responses a lot. I used ChatGPT for a year for a lot of personal stuff, and tried a new account with basic prompts and it was pretty much the same. Lots of glazing.
Every single one of my non-techie friends who use ChatGPT rely heavily on memory. Whenever they try something different to it, they get very annoyed that it just doesn't "get them" or "know them".
Perhaps it'll be easy to migrate memories indeed (I mean there are already plugins that sort of claim to do it, and it doesn't seem very hard), but it certainly is a very differentiating feature at the moment.
I also use ChatGPT as my daily "chat LLM" because of memory, and, especially, because of the voice chat, which I still feel is miles better than any competition. People say Gemini voice chat is great, but I find it terrible. Maybe I'm on the wrong side of an A/B test.