Long-term concerns

At first sight, Notion is perfect for me.

I was so excited to see how efficient it is that I ended up dedicating a day to building a framework of how I can see myself using it daily for years to come. Better yet, I can see how the more I use it the better it becomes.

BUT.

I'm worried about the business model, and whether it's a smart move to dedicate so much to it. The basic concern is that I'll dedicate hundreds of hours over 3-4 years and then the company will go bankrupt or be bought or who-knows-what and it'll all go to waste. I'm old enough to have lost sites on Geocities, profiles on MySpace, and most recently Facebook (my account was hacked&banned). The latter site is a second, related concern: I'd like to keep my private data private and safe.

So, can I at least download all data I upload to Notion in some format that other apps can process? Has anyone heard of any plan to implement E2EE? And at the very least 2FA?