Question

It used to be a pleasant little community, until the leaders sold out to the developers.

Accepted Answer

(idiomatichttps://en.wiktionary.org/wiki/Appendix:Glossary#idiomatic) To abandon or betray one's supportershttps://en.wiktionary.org/wiki/supporter or principleshttps://en.wiktionary.org/wiki/principle to seek profithttps://en.wiktionary.org/wiki/profit or other personalhttps://en.wiktionary.org/wiki/personal advantagehttps://en.wiktionary.org/wiki/advantage.

Sentence	It used to be a pleasant little community, until the leaders sold out to the developers.
Definition	( idiomatic https://en.wiktionary.org/wiki/Appendix:Glossary#idiomatic ) To abandon or betray one's supporters https://en.wiktionary.org/wiki/supporter or principles https://en.wiktionary.org/wiki/principle to seek profit https://en.wiktionary.org/wiki/profit or other personal https://en.wiktionary.org/wiki/personal advantage https://en.wiktionary.org/wiki/advantage .

Pleasant Community Leaders Sold Developers Abandon Betray One's