I just figured out that Stake has this promotion on the first day of this month and they have mentioned that this is not an April fool.
As I have said earlier the April fool offer doesn't suit the casino business. Still, casinos could offer something special like Stake did. Of curse not to fool people.
If a platform has a monthly or weekly bonus system. They may give it early to celebrate April fools day.
making some problems about their Casino. Most of them does have their promotions on these times so it does vary on someones preference if it looks interesting or not.