It could possibly be that it was a challenge for him to stay motivated, if the Suzuki paychecks were not showing up in his bank account. He wouldn't be the first rider to have decided to do this.
What should M4 do? Continue to develop and manufacture motorcycle performance exhaust systems, and analyze what their ROI is by the end of the year, having invested their 2023 advertising budget heavily in the Ulrich family / Team Hammer brand identification for this year.
Unless M4 is actually offering to pay... I say Fong is out. I think Tony was either riding for free... or paying to ride the M4? That is why Fong left in the first place...