ALWAYS have a backup plan when using any 3rd party's product. With a startup, there is a possibility of a given product disappearing within a not too long time

ALWAYS have a backup plan when using any 3rd party's product. With a startup, there is a possibility of a given product disappearing within a not too long timeframe due to either (1) selling to another company and shutdown immediately aka aqui-hire, (2) selling to another company and being absorbed into that companies competing product, (3) running out of money and shutting down, (4) pivoting to another vision that is more financially viable but doesn't suit your personal business needs anymore, etc. And if it's a free product, double or triple (at a minimum) the likelihood of any of the above happening.