Enshittification is inevitable for all free services (services as in with a server component).

No, it is not that bleak. It is only inevitable when there is an active push for a short-term maximization of user base monetization (which is very much in the nature of VC). It can usually be avoided with products that are wholly under the ownership of all users (such as a cooperative or a government-provided service) or - only if one is lucky - with products of financially independent private enterprises under vaguely benevolent and unhurried leadership (such as Steam, to some extent)