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If someone is thinking about keeping websites online for a really really long term, then always should choose the option to register own top level domain name, which is independent of any webhosting, registrar or any other company.
This way if anything will goes wrong with the webhost - we can move on to another one without changing the address, keep all the visitors and position in the web. If the webhost won't be enough one day and dedicated server will be needed, no problem. Even if the domain registrar will bankrupt, we can change the registrar and keep the domain. At least one own domain for ~10$ a year (to have multiple websites under subdomains of it).
At the very early stage of my "webmaster adventure" I was using free subdomains from the webhosts. Very quickly, after ~2 years I've regret that, when moving between the webhosts I've had to inform all users about the address change. I've moved to free subdomains from the services other than webhosts, which can be pointed to any webhost. That was better solution but again, after ~4-5 years even well known services with good opinions started to disappear. The only one I still know and can be the last resort is freedns.afraid.org (not to mention .tk/.ml/.ga/.cf/.gq domains, which I do NOT recommend at all), all the other that had tens of thousands customers and years of history doesn't exist anymore. So finally one day I've decided to pay for the domain name, at least I know that no matter what will be in next 10 or 20 years with any webhost or registrar, my websites will be still under the same addresses (and I can keep the same email addresses) as long as I'll pay for the domain and have the backup copy of files and databases.
Unless someone doesn't look further than few years ahead, or see no problem in changing the address every few years, then free subdomains from the webhosts are fine.
