Wait a sec — you're saying you'll take the time and trouble to "... figure out how to migrate to Obsidian" rather than pay the $70-$80 renewal premium over what you paid last year? Let's do a thought experiment. Suppose you spend a total of 3 hours from start to finish doing the migration. That's the equivalent of being paid $25/hour in lieu of paying the Evernote full price renewal as opposed to what you paid on sale last year. I have a feeling you would not consider that close to being what your time is worth nor to what you're paid in your day job.
You might be surprised to know that I also mow my lawn, I clean home, I cook sometimes, I do laundry, I drive myself to work, and I sometimes even watch TV, spend time on HN, or play video games.
Aside from the fact that such calculations aren't necessarily applicable anyway, it is incorrect because they would most likely have continued to use and have to pay for Evernote for more than just the one year.
I'm trying to imagine a product manager calling me to say, "Hi, we just bought this product you use, we're raising prices and firing the dev team. But hahahaha, you can't quit us, I have a spreadsheet here that says your time escaping our clutches will cost you more than paying the extortion fee to cover us buying the tool and the profit we need. Tough luck, but you have no logical alternative."
I'm not sure that my relationship with tools is so bloodless that it is only driven by dollars, cents, and minutes. I'm not sure I have to clench my teeth and write that product manager a cheque.