The friendly thing to do by bunq would simply raise the limits of those €100 users to €250 and be done with it. They won’t really loose anything and it’s very kind.
Sending out the message before people updating isn’t the smartest thing to do, so they should regocnise their fault, be nice, and raise the limits.
If it’s a technical limitation, well, fix it...
Cheers,
A bunq fan