Companies count on the "cheapskates" and the free plans to work as a "gateway drug" to corporate plans.
I sometimes feel this services "need" an affordable paid plan, so I don't "freeload" on their free plans, and I don't need the expensive big plan.
I.e.:
I monitor a bunch of my hobby sites with StatusCake. They're great and I use the free plan but I'd like to pay a little for very simple monitoring. But the first paid plan is around $200 a year. But I don't need the premium plan, I just need the free plan, but paying, so I feel like I'm contributing to the business.
AWS and the others... you've got a free plan, but once you begin to deploy... ;)
DnsMadeEasy. They don't have a free plan, but I'm using their "Small business 10 domain plan". That was $30 a year for years. Past year was $40. Then they got acquired by DigiCert and since last month they've posted their new prices: ~$200 a year for a 5 domain plan.
It happens in a lot of providers, so I guess is a regular VC tactic to acquire volume, clients, publicity or whatever.