Revolut is also for private users. You have a currency conversion limit of about $5000 per month (or perhaps that was €5000 or £5000). After that you’re hit with an extra exchange rate markup (only 0.5% for major currencies). If you upgrade to Revolut Premium (£6.99 per month) you don’t have any conversion limit.
However, the real limit for most is the annual top up limit (I think that was around $/€/£20,000). It can be raised to the amount of money you can demonstrate that you make in a year (using pay slips, tax returns, etc), but it’s a bit of a hassle—especially if you don’t have a regular monthly salary or are optimizing your taxes heavily like many in here do.