As a rule, such agreements are generally implemented in three forms:
payment of monetary compensation;
payment of equity compensation;
taking over the control over the board of directors.
The payment of compensation by the founder to the investor or vice versa may be subject to various conditions, including:
financial performance (e.g. EBITDA margin);
non-financial data (e.g., product quality metrics);
certain events (e.g. IPO).