(Translated copypasta from the Portuguese community, yeah, but since not many English speakers understand Portuguese, worth doing)
Dunno the site, but one thing I do is to go to a site known as "AppSales" and to hide whatever titles I find with MTX with Ublock Origin filters. The process is a chore, but at least, each title needs to be hidden once and only once.
And sure, this is considering that the person uses only Google Play. I, for one, prefer to seek games in stores like Humble Bundle (owned by IGN), Itchio, and so on.