1. In this case, Moons are on the Ethereum network and a number of options exist to move them off reddit. You can even swap them to other crypto if you fully want to divorce yourself of Moons (or the others).
2. Agreed, however these are for-profit companies. They will not share databases. They want to keep you in their sphere. And sharing a centralized database means that database can be knocked down much easier than a distributed network.

To your other points, this isn’t about transfering your karma. Moons (et al) are not karma. That’s why your karma remains the same even if you transfer your Moons out of your vault and into a wallet somewhere else (or just sell them off). I don’t think many people want their reddit accounts linked to their other accounts or real identity anyway.

The entire point of these community coins was for them to be used for governance. CryptoCurrency is a good example: the mods are pretty hands off on the grander scheme of things. Anyone can propose a change or idea, and the community will vote on it. Can it be done without crypto? Definitely. Did Moons encourage people to stay engaged and govern once a month? YES. A resounding yes. It also incentivized engagement because you could earn rewards for commenting or posting. And the rules surrounding what is earned and how much was voted on by the community, and actively managed over time to address issues like low effort posts that are overrunning reddit elsewhere as people feverishly try to build up accounts before reddit’s new “revenue sharing” model rolls out and makes things expontentially worse (but reddit has full control over, with no community input, because reddit inc is the sole governor now and people cannot transfer or convert anything without reddit’s blessing and every changing rules.

Take Reddit gold as an example. Reddit controls everything including the rules. That’s why all the people with tons of gold are pissed because they had its one use phased out with no recourse. But Moons have been able to be transferred to your own non-reddit wallet and converted into other things for a while now. Reddit has no control over it in the end, the community is likely to keep it alive themselves just without minting new coins, and this is likely why reddit is killing it but not NFTs.

Reddit does not want a community-controlled competitor to their new revenue sharing grift on their own site.