Netflix and Spotify actually makes sense to be subscription based. Amazon depends on how often you do shopping through them since it’s actually free (if you don’t include the fees) to function. I definitely wouldn’t pay for Dropbox but cloud storage and sync pretty much has to be a monthly subscription. If you are going to be against something at least be against to the parts that makes sense to be against of.

I can’t understand the joke. :/

If you ever decide to host your own, via VPS or sth consider checking docker-mailserver and watchtower. First takes care of the mail stuff and the second updates your containers frequently so you will not have to manually update to new versions of the container (for security patches etc.).