Even GPL is pretty low risk for a hosting company, but LGPL's risk is strictly lower.

He made a small business and he's targeting small companies who are probably still running a cracked version of photoshop CS6.

Big companies have rules about which OSS licences they can use and enforce them on their developers. Developers in general will just skip it and pick an alternative they can use without problems from legal and possibly without paying.

So even with the license in place, I don't think it would ever magically attract big clients.

I think the author needs something a bit more unique or way better sales to get larger businesses. They are all likely on Amazon SES or SendGrid.