Many thanks, Dr Richard Schmidt for signalling and reviewing the recent Hungarian Supreme Court judgment (in Hungarian) discussing unilateral aka asymmetric aka hybrid choice of court. I do not have Hungarian and happily rely on Richard’s analysis and review.
As Richard reports, the contract was governed by the law of Liechtenstein and provided that any legal disputes would be brought before the court of Vaduz (Liech). However, the claimants had the option of seeking the performance of the contract before the courts of the defendant’s domicile. The defendant failed to pay the service charges and the claimants sued him in Hungary.
Upon appeal it seems the lower courts had held that choice of court ex-EU is not covered by Brussels Ia (compare CJEU Gothaer) and stayed the case in favour of the court at Vaduz. The Supreme Court however in principle would see to have upheld the choice of court provision as exercised by the claimant even if it decided the case ultimately on a finding of submission.
As I said I do not read Hungarian, text search however does not suggest that the SC looked at the issue at all viz Brussels Ia. Which is odd.
Richard justifiably refers to the approaches of both the English (see e.g. here) and the French Courts (contrast Rotschild with Apple). Thankfully there is now also the volume edited by Mary Keyes, looking comparatively at the issue (Michiel Poesen and I contributed the Belgian chapter).
(Handbook of) EU Private International Law, 2nd ed. 2016, Chapter 2, Heading 2.2.9, Heading 188.8.131.52, Heading 184.108.40.206 .