They may say they have made an "error", but if you need to reinstall iOS or iPadOS for whatever reason, you're no longer "grandfathered in". For me, what I'm seeing, is that it's behaving as if I'm a new user again after reinstalling Spark on my iPhone. It's running me thru their new setup "experience" as if I've never used the app before. So, if this is also not supposed to happen, that's very telling of how buggy their app is.
I think at this point, after all of the complaining about forcing you to use their signature and locking that behind a $60 a year paywall, and then not-so-quickly back peddling and saying it's a "bug" is totally ridiculous. So even then, lets go along with that- 3 days go by where a "bug" tries getting you to pay $60 a year? Seems more like shady business practices than bad software development. So they're blaming this on their software team, making mistakes? And then a pretty large mistake like charging people $60 a year makes it thru QA? That's even MORE telling about their company. I wonder how much money they've made over the last few days over this "bug"...
And when you say "the terms & conditions are on our side", the "terms" on their pricing page haven't changed. Still says these things are locked out behind a paywall. As for the macOS version, earlier in this post's pages of comments, someone mentioned that Spark v3 wasn't available on the Mac App Store yet, only on their site. So I downloaded that and installed over the Mac App Store version, and now I'm screwed. It still "works" on my iPad, and yeah I'm able to delete their text out from each and every single email I create.. But at this point even THAT instance of Spark isn't showing all of the contents of each of my mail folders. I can go to WebMail or just another Mail Client, any Mail Client, really. All have been accurate accept Spark.
Again, I've moved on, and when companies start hiding shady business practices behind "mistakes" and "bugs", is it really that or is it just them placating us long enough to try and make more money off unsuspecting users, or even worse, large scale companies where they rake in even more money?