CA's political stance is basically irrelevant here, they're mercenaries. "Liberal" companies of this stripe would easily do the same thing if given the opportunity. The sort of work they do is intrinsically compromising unless your business is operating with a very firm moral/ethical code and it really hinders your ability to chase opportunities and maximize revenues.

It's not a coincidence that Google ditched 'don't be evil', and doing that doesn't indicate a twist to the far right or anything of the sort: It's just the reality that being a wildly profitable advertising firm can require a lot of moral/ethical flexibility that leads to outcomes like what we have here with CA & SCL.

The significance of CA's politics is specifically that they gave their services for free to a political campaign that aligned with their goals, which is already of questionable legality - and in this case, likely expected and possibly already received regulatory kickbacks in exchange. But that doesn't really matter in the context of FB deciding to enforce rules.

EDIT: To clarify, Trump's campaign did pay CA but sources have claimed that they received a deep discount.