1. Businesses would want features that individuals don't care about. More importantly, they would want features that I don't care about. I made Readlang to serve my own needs as a self motivated learner. I feel like I have a reasonable barometer for what's useful and what will appeal to individuals. Creating something for business would be more difficult and less fun for me personally.
2. There's still a hell of a lot of room to grow with individual language learners.
3. Even if the profit is lower, I can probably reach a larger user base with a freemium consumer product. I think that the quantity of feedback and data that this provides helps me create a better product. (On the other hand - I'm sure the revenue that may come from a B2B product would also help!)
4. I can always try selling to businesses later. And with a proven, popular consumer product this should be an easier sell.
Regarding the name & branding. I'm sure it's not optimal but I'm not an expert in this and it was the best I came up with. I'm going to run with it in the short term at least.
Thanks for the advice and encouragement!