Yes, considering his instance has a single user, himself. If more people sign up to his instance, or he just uses it, the costs will keep going up due to the c

Yes, considering his instance has a single user, himself. If more people sign up to his instance, or he just uses it, the costs will keep going up due to the caching Mastodon does for assets (and especially due to the fact he also doesn't have purging enabled)