I've never even started. I only have a handful of subscriptions only for specific and scope-constrained services that can be easily replaced, such as:
* JetBrains (IntelliJ/PyCharm IDEs), with an option to stop paying and still keep the last version you paid for - that integrity keeps me paying for it even though I don't technically need the latest version. Can be replaced with Sublime Text, other open-source alternatives or worst-case scenario, Vim with open-source plugins
* Office 365 (or Microsoft 365 or whatever they're calling it now), only ~2$/month for hosted email and 1TB OneDrive space so worth it, don't need anything else. Can be replaced with a self-hosted server if needed (I already run some for clients).
* Kagi Search, it's pretty good but I subscribe mostly for supporting them rather than any specific benefit - it it was purely about the money then I'd say DDG is good enough. Can be terminated if the value is no longer there or if it start smelling like "growth & engagement".
Any consumer product I don't bother or milk the free trials continuously - Spotify has this nasty habit of "personalizing" everything without an opt-out so I just create trial accounts every couple months to reset my profile and avoid getting into a filter bubble. I also have downloaded mixes from various YouTube/SoundCloud channels (via youtube-dl) that keep me going through the day, are available as local files and don't rely on a shitty, memory-intensive and network-dependent player to play.
For movies/series, the very few times I want to watch something, a friend usually has what I'm looking for, and worst case scenario, that friend can always be "the pirate bay". In hindsight I've got very little time to watch anything anyway and get most of my entertainment from free YouTube content (proxied via Invidious so no ads/etc). Patreon or ad-hoc donations take care of the "paying creators" aspect without giving any penny to Google who couldn't even be bothered to respect the GDPR until very recently so no bad feelings there.
Gaming wise, I still get plenty of value from my fully-paid-for copy of Battlefield 3 and am not interested in anything new if it involves subscriptions, microtransactions or having to grind for months before getting good weapons/ugprades as I don't have time for the latter anyway and would rather spend that time enjoying BF3 where I'm already fully leveled-up. Old copies of Minecraft (Beta 1.7.3 - the real Minecraft, self-hosted servers and friends) also provide tons of value.
Anything else, not only do I not see enough value in it nor am happy with the (usual) privacy concerns, but wouldn't want to commit anyway in fear that they'll alter the deal in the future or change the software to benefit "engagement" at my expense.
The current list of subscriptions above (which is all it is - I don't think I omitted anything) is alright for now but can and will be replaced should they alter the deals in a detrimental way.