No community springs forth fully-formed. Lemmy's already had one big influx of users after the reddit blackout, and we can expect there to be another wave (to some extent or another) tomorrow after the major apps shut down. Some of those users will certainly have been subscribed to /r/games and not /r/gaming, and are going to want an equivalent community here.
The only way to foster that and let it grow is to enforce the requisite rules that keep the community from turning into a cesspool right at the start. Maybe it'll slow overall growth, but it won't kill it altogether. If that means that /c/Games here doesn't end up as the pre-eminent Lemmy community for games, well, so be it. /r/games was significantly smaller than /r/gaming, but it still thrived.