Just as the gov required google to remove the app they can also require the big email providers to block all emails with links to it.
99% of the people are on the big email providers.
Also, you will quickly find out that sending many emails from random addresses (ie: spamming) doesn't work these days, they will be blocked by existing anti-spamming techniques, as evidenced by multiple posts on HN of people trying to do that from their own mail server.
You need to go through a whitelisted mail service (MailChimp, ...) which is another block point.
99% of the people are on the big email providers.
Also, you will quickly find out that sending many emails from random addresses (ie: spamming) doesn't work these days, they will be blocked by existing anti-spamming techniques, as evidenced by multiple posts on HN of people trying to do that from their own mail server.
You need to go through a whitelisted mail service (MailChimp, ...) which is another block point.