There are certainly a lot of competitions that you can take part in on chess.com and you don't really have to pay on it and at the same time the winner gets awarded not just a trophy 🏆 but at the same time they also get cash prizes as well, therefore I do think you can use it pretty much for what you are aiming for but you must play on the site for a while till you are allowed to take part in these competitions as well other than that you can do P2P completions make a thread of your own, have a live game with people who are interested here on the forum as well, there are no bounds, if there are not any particular games then you can just make your own, if this suits well then at the end of the day then you can make your own website as well.