Taking into account what was introduced to the olymp trade community instead of ancient bonuses, of course it's justified.
A whole new mechanism implemented by the company can bring you way more profits that it was back in the day with bonuses.
Yeah, one may claim that it's not convenient that majority of traders were forced to adapt to the new increased profitability system, but I guess they quickly got used to it.

It's not only justified, it was necessary as far as I can see the olymp trade situation with promotions.
The old system with all those promo codes was very unpopular. At least I don't know a single trader who use those promo codes. In fact the majority of olymp tarde customers didnt even know about them at all.
So the fact that they implemented new promotion schemes is great.
Plus it give higher fixed time trading profitability which all traders love.