Trending @Capgemini; Will Capgemini give matching or increased offer, if we got offer from outside with 70% increase as a associate consultant role

It depends on situation.
If you're critical resource to them, they will retain you. Otherwise No.

Mostly - No

Depending on your project and your dependency in the team, you will not be retained as 70% is a huge number for CG

Capgemini retains an employee depending on the criticality and the requirement in project. Also a major factor is your ask. I have rarely seen people getting retained above 50% hike.

Nice opportunity to check your luck and negotiation skills.

Don't think so....cg rarely values own employees

Which company is offering