Do you have other ways to get around? Maybe moving to a place that does? I realize I'm not answering your question, but there's only so much fun you can have indoors by yourself all the time. You'll end up feeling bored eventually no matter what. You specifically mentioned that outside is scary, which I think is the core problem here. Doing some exposure therapy by yourself or with guidance from a therapist could help.
You could move from a house to a cabin, trailer, or cave. Then you only have to deal with cabin centipedes, trailer centipedes and cave centipedes. But the house centipedes will be a thing of the past.
One thing that rings alarm bells for me is that they have a built-in adblocker, but you can enable Brave's ads instead and get a cryptocurrency reward. Brave takes 30% cut on the ads they show this way, so they are essentially replacing the website's monetization with their own monetization. Kind of scummy, and it being a cryptocurrency also looks grifty.
Because nearly 90% of users use Chrome or a derivative thereof. People can make a V3 version for Chrome and a V2 version for other browsers, but the APIs are nowhere near compatible, so it's a lot of extra work. If you just make a V3 version, it will work on any updated browser.
Both of them identify users by URL, there is no numeric ID, UUID, or public key.
Using IDs or UUIDs would not be secure since the imposter could just copy the ID from the previous user as well as the username and domain name.
Verifying identity would necessitate the user having a public key as their unique identifier, and federated servers performing a challenge-response that requires the user to have the corresponding private key for that public key.
In conclusion, it certainly seems like you could take over someone else's domain name, and I suspect that public key cryptography is the only way to avoid this.
(edited to add: expired domains aren't the only attack surface here, domain takeover is also a thing, either by transferring the domain or simply changing the DNS records.)