H1B approved - not joining the sponsoring company - effect on future H1B petition

[blackbluetears]

Company xyz had sponsored a successful H1B petition. I changed my mind and will not join this company.

If a future employer applies for an H1B visa for me, will they know about my previous petition?

If the xyz company revoke my H1B visa, will that affect my chances for a H1B in the future?

Thank you in advance.