@hcf that's just wrong and you know that.
For example, if "#Security" was a real issue, they'd host their #IMAP+#SMTP access exclusively over @torproject / #Tor because #OnionServices are using fully-encrypted connections in a self-authenticating adress spaces.
I brought up @monocles because they at least don't lie to customers and are honest about security & privacy!
@benno Not transitioning assumes that the continued Pain and Suffering is less great short, middle and longterm than any migration.
I consider any #LockIn, espechally *toxic Lock-In as described a big problem that needs to be dealt with at some point.
If one cannot even consider a slow, step-wise migration then obviously the pain and suffering of said #CCSS is not high enough as push factor because #FLOSS has all the pull factors it'll even have...