Great to hear that others are giving them feedback on this! They also reached out to me after I gave a one-star review on Play Store and wanted me to contact them by emailing help@revolut.com. So if you're a customer and have been locked out of your account because you had to reinstall the app or something, there's a way of contacting them without using the app (I couldn't actually find an email support address on their website).
It's interesting that older versions still work. However, I think a heads-up here is justified: it's not unusual for developers to, after some time, start blocking older app versions from connecting to their servers. Or the older version might stop functioning because they made an update to their identification method or whatever in a newer version, making the older version fail. So I think it's unlikely you'll have access from the older version in the distant future.
krysor I've just received an update to the version 10.56.1.
Does the issue still persist?
Yes. I saw the update today and actually hoped, while it was installing, that they had reverted their decision. But no.