Domain names are actually the cheap bit. About $8 per year per .com domain. Hosting is where it gets expensive
I'm not 100% familiar with the development stack of this website, but I did a back-of-the-envelope estimation on the cost to rehost everything onto AWS. It came out as around USD$70 every month.
However, the estimation of the amount of data on this site might be off by an order of magnitude, which would make the costs double or triple.
<input type="button" class="form_button" style="width:auto;padding:1px 10px" value="My estimations" onclick="if(this.nextSibling.style.display==''){this.nextSibling.style.display='none';}else{this.nextSibling.style.display='';}"><div class="spoiler_body" style="display: none; ">100 GB of storage for storing all user data, blogs, comments, and random other DB data
1000 GB for images and other similar data
100 emails sent per month (this number can be off since AWS' SNS can send up to 1000000 a month and still be free w)
The server specs: two vCPUs, 8 GB RAM, 30% utilization across an entire month, with no attached storage</div>
I could also cut costs by eliminating old data that will never realistically be accessed again, but then it'd lose the appeal for people to return to check up on the site every once in a while.