Based in TPE, and I also received the same message today, titled "Life’s a beach" with a sunny beach house photo (doesn't work well with the season though).
Same email. "Life’s a beach": such a classy wording.
I checked their website and it's indeed 75% bonus, ie.buy 4,000 mile for EUR110, and you get another 3,000 miles (7,000 miles total).
Can go all the way up to EUR2,750 for 100,000 + 75,000 miles. Which is nearly a Europe-Asia round trip Business Class award ticket?
Is it worth it?
Not for me. On AF it is impossible to get decent pricing in miles for J awards on the SIN-CDG route during my usual dates of travel. KL is better but involves a stop in AMS. And if I have to stop, I can get decent fares under 2000 EUR with VN. Availability is very good.
2750+ EUR remains a lot in my opinion to play the award pricing roulette of FB.