100,000 votes (and really probably closer to 150,000 influenceable votes across those households) is a significant number compared to 10 companies who own an average of 10,000 properties each, yes.

Companies with tremendous wealth manipulate voters and lobby their representatives. Don’t presume that voters are remotely well-informed of who backs their interests.

If wealth could simply buy elections then Clinton would have won over Trump in 2016 and Sanders would have won the primary over Biden in 2020.

Consider every other expense that people have that's supplied by companies (see: literally everything). Why have those companies not successfully lobbied to prevent competition? Industries where it happens are the exception, not the rule.