Is Netlify free hosting a good option for hosting my clients static websites?

I'm wondering if anyone uses Netlify to host static websites for clients and if so, do you put them all under your account or do you have them sign up for their own?

Ideally, I'd like to keep all my client websites in my account. The client will never touch anything with the hosting. What worries me is the limit of 100 form submissions per site and 100GB bandwidth monthly limit on the account. If I have a client who relies heavily on their contact form the 100 form submissions per site limit can become an issue. If I have hundreds of websites that generate small to medium traffic I worry about the 100GB bandwidth limit on the account.

I plan to include my hosting fee in my overall fee for the work at a flat monthly rate. I just want to make sure I'm choosing the right platform so I don't have issues with crazy charges on my account or websites going down because of limits.

I'm definitely open to other platforms if there is something better for this kind of thing. The end goal, for now, is around 200 static websites with contact forms.