Nice article. I thing you should change the title of the "Other Alternatives" section to something else (maybe "use a secondary e-mail address") since it is a quite important aspect when you try to avoid spam and there is no way around it (at least for me it is not an alternative, it is the only way
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). There are multiple "disposable e-mail" services but (like you) I feel that the best option is a second g-mail account. If really needed I can create a filter that forwards some e-mails to my daily e-mail address.