Yes, they are ... !
www.bbc.co.uk/news/uk-england-38155475
TOBLERONE ... for example - famed for its uniquely distinctive triangular chunks - introduced a new shape and size earlier this year ... causing devotees to "see red" in, shall I say ... ... more ways than one!
But they're NOT alone! ... there've been many other, equally well~known brands - guilty of doing just that - over much longer periods - e.g., Cadbury, Mars, Maltesers (owned by 'Mars'), Kit Kat and (why "whisper" it?) "Wispa" made by Cadbury, which had been bought by the "crafty Kraft" group ages ago!