When I was using Bitbucket and an S3 instance where there is a lot of upload each time (I was using a HUGO Static Generated site at the time) my monthly costs were around $5 - $8 over the FREE allowance - roughly updating on a daily basis.
Now I am using WriteFreely, still updating once every few days or so, single user - based on a AWS EC2 instance, also using AWS Route53 to register my domain my monthly costs are approx $1.50.
For my usage it is less than when I was using VULTR to host my sites. A lot will depend on your usage environment.
One of the reasons I switched from HUGO to WriteFreely was the ease of administration. I still wanted a bare-bones blog with very few, if any, bells & whistles. I also wanted to really restrict the outgoing costs to the absolute minimum for a personal use only site that I have control over.