Case T-834/19: Judgment of the General Court of 1 September 2021 — e*Message Wireless Information Services v EUIPO — Apple (e*message) (EU trade mark — Invalidity proceedings — EU figurative mark e*message — Absolute grounds for refusal — Descriptive character — Lack of distinctive character — Declaration of invalidity — Provisions applicable ratione temporis — Application of subsequent case-law — Article 17 of the Charter of Fundamental Rights — Principles of protection of legitimate expectations and of legal certainty)