"You did not receive any rewards for this round due to lack of participation."

It says right in the box that you need 10 banners minimum to get rewards … you deciding to just give up made you lose rewards

You need to get at least 10 banners to receive rewards at the end of a round. You get those 10 points by simply attacking for the first time (regardless of win or loss). It's possible that you have to actually complete the battle and that crashes don't count (as it doesn't register as a completed battle). You should have just sent in another team, get the 10 score, and then call it a day. Crashes are indeed unfortunate, but if you are too lazy to even get 10 points, and give up immediately, then I'm also wondering why you keep playing. Next time just beat any 1 team your opponent set, and then stop if you don't feel like playing. That way you will have your guaranteed 60 or 70 something score and will get your rewards for sure.

So jump through more hoops to make up for game's bad programming and inability to keep track of matches server side, like some other games already do? Got it.

Whoever approves in game text should also word things more carefully. Participate doesn't mean what they think it means.

Participate means whatever the organizers of an event decides it means.

In this case it means "Have a battle logged on the server as complete". Even a forfeit is a kind of complete.

You can use whatever definition you like, but don't expect anyone to listen.

It's possible that you have to actually complete the battle and that crashes don't count (as it doesn't register as a completed battle). You should have just sent in another team, get the 10 score, and then call it a day.

Happened to me, but sending in another team did NOT get logged as participation. That's an outright bug in my view.