There are several specialist channels that cater to specific interests. They don't have the breadth and depth needed to serve as your main streaming service, but they may be worth adding on top or as part of a package.
For people who like documentary.
For a very reasonable $3 a month or $20 a year, you can get thousands of high-quality documentary films and TV shows from the Curiosity Stream. If you want 4K content, the price goes up to $10 a month or $70 a year.
For people who love animation.
The ultimate streaming service for cartoon and animation fans is possible. It currently includes a number of companies. The service costs $10 a month, but the channel lineup changes frequently.
Reality TV fans.
Discovery+ has many lifestyle shows, documentaries, and original reality TV shows, covering cooking, travel, home improvements, history, true crime, and more. The ad-supported tier is $5 a month, but you can pay $7 a month to go ad-free.
For sports fans.
Some NHL and MLB games, college sports, and soccer are shown on the service. It doesn't have live NBA or NFL games, but sports are underrepresented in on-demand streaming, so fans might feel the $7 a month or $70 a year price is worth paying. If you combine Disney+ and Hulu for a monthly fee of 14 bucks, you'll get better value.
British TV fans.
Britbox has more British boxset than any other service. There are many British TV shows and films produced by the UK's public service broadcasters, including the BBC, ITV, Channel 4, and Channel 5. It costs $9 a month or $90 a year.