There is never a need to be that direct. Republican and Democrat donors tell politicians what positions to take. Trump doesn't need to take money directly from a company. He takes it from his donors, who in turn take it from the company in some form.
In this case, the theory is that billionaire Jeff Yass (an investor in Tik Tok) has "persuaded" Trump to flip his position.
https://www.nbcnews.com/tech/tech-news/jeff-yass-billionaire...