I use Multireddits for that. They let you view a custom feed by concatenating subreddit names in the URL. No need for login or subscriptions. E.g. https://www.

I use Multireddits for that. They let you view a custom feed by concatenating subreddit names in the URL. No need for login or subscriptions. E.g. https://www.reddit.com/r/linux+privacy https://www.reddit.com/r/linux+privacy