If one ever makes the mistake of giving Medium a valid email address, one's inbox will be 78% Medium article recommendations until one gets quite aggressive with the spam flags.
It's quite easy to disable the daily or weekly digests if you don't want them. Not saying I think medium is perfect, but there are better ways to approach the problem then training a spam filter.
If I've tried to turn if off once, and either it hasn't worked or it later reverted, I'm not wasting any more time on it. I can press the spam button without even leaving my mail client. I don't work for these spammers, and I don't owe them anything.
Of course, the majority of said articles the site recommends seem to be those by someone with an existing audience/fanbase, or which already got a ton of likes and shares.
As far as someone without an audience posting an article is concerned, the chances of Medium suggesting your work this way is pretty slim.