Could've probably done it quicker if I did more things that don't scale (as people often say). Should've focused less on SEO and more on outreach or other growth channels.
I've since got my CS degree and I'm working on it full time now :)
How can your customers be sure you do not inject any faulty or malicious stuff into their apps?
We obviously don't inject malicious stuff since that'd ruin our reputation immediately (& open us up to lawsuits). I could see that happening with free app builders, but we make our money from subscription fees, so we have no need to turn to such illegal stuff to monetize the apps.
Even going open source wouldn't solve the issue, since most customers wouldn't be able (due to lack of technical knowledge) to compile the app themselves.