Where possible, the previous locations would redirect to the sites within this domain?. For example, https://scam.fsp.ws now redirects to https://scam.fsp.fyi. This is designed to keep the visitors of the old site by sending them to the new site. This makes life easier for them since they might have bookmarked the site. To redirect, it is just one line of code into a .htacess file.
I no longer promote the previous locations, and instead use the sites within this domain. Since each subdomain? is its own site, it just makes sense, especially since I have unlimited subdomains, I have a lot of flexibility only matched with my knowledge that I can provide to others.