Well, ultimately mastodon/lemmy are hobbyist projects. They would naturally count as “provided as is, with no guarantees”.
I don't know about Lemmy, but Mastodon the software project is most certainly not a hobbyist project, blowing it off as one is just tone deaf. It's a real non-profit company with actual developers on an actual payroll. mastodon.social and .online are real expenses on the balance sheet of that non-profit. pawoo.net was started by pixiv, a for-profit company, but changed ownership several times and is now owned by Sujitech LLC (along with mstdn.jp and mastodon.cloud). The owner of misskey.io is also in the process of forming a company.
Yes, they are "provided as is, with no guarantees" but the people who run them are completely and sincerely invested in their sustainability as more than just hobby projects.