Opinion based on nothing but how I perceive the fediverse to work and some commentary from Jerry Bell who runs infosec.exchange on Mastodon - support your instance provider.
The costs to maintain the infrastructure are borne by the admins of the instances and for the larger ones, things like storage and transport costs are growing exceedingly quickly. Beyond that, your account disappears if your instance dies, at least until the devs contributing to the Lemmy project figure out cross-instance user registration, validation, and migration.