General search term.
Might be referring to: protonMail offers nearly the same level of end-to-end encryption, though it does NOT encrypt email subject lines. ... Your full-text searches are NOT encrypted, however. Tutanota combines AES 128-bit and RSA 2048-bit protocols to give you end-to-end protection.Apr 6, 2020.
This is a seasonal trend that repeats every May.
This trend is forecasted to be growing in the next 2 years.