I'll go first, I use Notion personal pro account ($4/mo) to get access of page version history. I use Ticktick (todo list app) premium account (25$/yr) because it is more feature-rich than other todo apps and works smoothly on my android device.
I am very uncomfortable with a recurring payment for software, because I tend to adopt and keep the same workflows for a long time. I prefer free software because I don't have to worry about some parent entity suddenly making a later version incompatible with my current version (if that happens, someone could just fork it, e.g., MariaDB).
I have considered home security SaaS, like Ring or something, but I feel conflicted about the tradeoffs around superior security and privacy concerns.