Of course not, that’s entirely up to you! The Standard and Plus plans offer access to many other features and benefits besides an ISA.
Opening an ISA is a separate action in-app and should only be considered if it meets your investment needs/strategy.
If you decide to upgrade and you’d like to open an ISA, just head to the “Portfolio” tab in-app > 👤 Profile icon > “Open a Stocks & Shares ISA”!
When you invest, your capital is at risk. The value of your portfolio can go down as well as up and you may get back less than you invest. ISA eligibility and tax rules apply.