Its up to individual instances and apps to decide how to keep themselves running and its up to the users that form around those instances to decide if they like that chosen form, eg donations, subscriptions, advertisements
The benefits for users being they can just move somewhere else if they don’t like their choice
The difficulty for server hosts will be keeping up with demand and being able to afford to continue
Unfortunately this means that the instance you have chosen right now might not be here forever
A few months ago i started doing 20 minute walks in my neighbourhood everyday just while listening to podcasts and it has been a huge improvement to my outlook, as I work from home its been a big help