Is this ok to accept the game and cancel right away?

I think that there needs to be some sort of penalty for abandoning a game right after accepting it. I do understand, that sometimes you click and then somebody is calling you, it does happen, but i refuse to believe that this is what is happening all the time.

I agree that abuse of aborting a game should result in some kind of penalty. I've seen players that will abort any game they get as black, only to immediately offer a rematch-a sneaky way to game their ratings by 'secretly' only playing as white

There is some kind of penalty, but it works only if you abort 4 games in a row. Who will abort so much games at once? Only abusers, but there are not so many of them. The problem is in those imbeciles, who can't use the filter for searching games. And in those white-beggars. And in empty-headed careless helminthes, who jump from a game to a game, as if it was some funny clicking competition, who abort your so long-awaited seek and crawl to jump somewhere else (what a tapeworms, ah?). I believe, penalty for aborting games must be harder. 1 aborted game gives you 30 seconds ban. 2 aborted games gives you 3 minutes ban. 3 aborted games for a day gives you 30 minutes ban.
But first of all, you must repair your buggy match system.
1. When you leave the main page without cancelling your seek, it's still there.
2. When I join someone's game, I can sometimes realize that there would be 2 or even three games with this person for unknown reasons, so I have to abort those other 2 games.
3. In hyperbullet and bullet you have to put the time of awaiting before the ability to abort legally on 7 seconds. Not 15.

I agree, there are some circumstances when you'll need to abort a game, but I don't believe that is the case for all aborted games. I also think the lichess.org first needs to fix their bugs before adding bans.