Konami is pleased with the success of Super Bomberman R Online, which is now available on the Nintendo Switch platform via the eShop, as the company has announced that the game has now reached three million downloads spanning multiple platforms. Super Bomberman R Online is the company’s first stab at a free-to-play console Super Bomberman game. To reward players for downloading the game, Konami will be giving each player who plays Super Bomberman R Online by Sunday, 25th July a free 500 Bomber Coins to spend on what they please.
Konami celebrates as Super Bomberman R Online reaches three million downloads

Just played half an hour on Steam, got no coins. So either the reward period hasn’t started yet, or this is just a lie.
I won’t be very pleased if it’s the latter.
I got them today just for logging in. Didn’t even play a round.
3 million downloads, i got mines from the discount bin at my local Dollar Tree.