As the article explains, it won't even cover the base hardware costs. So you won't be "paying your part". The only reason to offer something like this is to "up-sell" to an actual properly paid plan, and since you will also lose quite a large percentage to payment processor fees, have extra support/admin overhead, deal with users who now feel entitles to "paid support", having a $1 or $2/month price point is just not worth it.

You will either need pay for it, or do it yourself on a cheap Linode VPS or Hetzner machine or whatnot.