It doesn’t seem like a very “walled” garden if they were able to migrate all their data including issues and comments

It’s never too late:

https://g.co/finance/TSLQ:NASDAQ

You don’t need to buy options. Someone did all that and made an ETF out of it for you.

That sounds like an awful lot of work to workaround a problem that shouldn’t have existed in the first place.

And how do you de-drm them? Is there like some community calibre plug-in for it?

Making note for when I buy books in future

Where do you buy from?

That’s where time dilation will kick in