Sharing below links for Proton Team to refer and get some new ideas and find Missing Features and Competitor Comparison:

For Drive:

https://docs.google.com/spreadsheets/d/1cEd65XDW3gBHnRsJ0rbq3V_B28mKySHiMPAZvArHiiA/edit?gid=0#gid=0

For Mail, Calendar & Pass:

https://docs.google.com/spreadsheets/d/1JqyglRJXzxaj8OcQw9jHabxFUdsv9iWJXMPXcL7On0M/edit?gid=469491148#gid=469491148

For VPN:

https://docs.google.com/spreadsheets/d/1ijfqfLrJWLUVBfJZ_YalVpstWsjw-JGzkvMd6u2jqEk/edit?gid=231869418#gid=231869418