The problem with web-based software subscriptions like this is that you don't really have any option to fall back to a perpetual license with the version you're

The problem with web-based software subscriptions like this is that you don't really have any option to fall back to a perpetual license with the version you're at. It's ok for shorter term use cases like specific projects, but it's hard to commit for longer-lived documentation or personal documents you want to maintain over years. Your usage may ebb and flow. Aside from that, the company may go out of business or just change its priorities.