Basically as Tanko says.
NASCAR is a monopoly controlled be a single family - and despite being a “league” the parent organization tries to bully owners into doing things their way.
Imagine owning any pro sports team and the league has the right to disband your team and toss you out for finishing in the bottom 3 for 3 years in a row. No way would you pay millions of dollars for a team knowing this could happen - and imagine how much the value of a team suffers after just 1 bad year.
Worse - the league has full control of your standings. Again - you play in a normal league and win - nothing the league can do about it - but NASCAR can simply make up a “violation” claim something wasn’t “approved” and void your finish position easily.
It’s complete BS and 13 of 15 teams agreed knowing that the 2 who would not agree are going to be in the short end of any decisions made by the parent company.