I wonder if there might be some super common spam tlds like .xyz or .ru or something, but generally, yeah, custom domain isn’t the issue. Some other options are Migadu, mailbox.org, mxroute, and Tuta all seem like decent companies. A lot of others “also do” email hosting, like porkbun and OVH. Plenty of companies host their email with all these companies and have mostly clear sailing without being spam binned.
I use good old wallabag for read it later because of how well it works in fbreader on my Kobo. Linkwarden for the bookmarks. It’s not really bloated if you think about how the archiving preserves copies of bookmarks in case the site goes down, and more crucially, allows for full text search.