Saturday's assault by Dettinger on police blocking a bridge over the river Seine has come to symbolise the increasingly violent nature of the protests against President Emmanuel Macron's government.
Marlène Schiappa, junior minister for equality, said: "Contributing to a fundraising kitty to support someone who attacked an officer is tantamount to being an accomplice to these grave acts of violence".
Christophe Dettinger handed himself to police and was immediately detained.
Leetchi initially defended its hosting of the fundraising, saying it was simply a "neutral" online platform.
Seven weeks into rebellion marked by weekly clashes in Paris and other French cities, Mr Philippe said the government would introduce a "new law punishing those who do not respect the requirement to declare (protests), those who take part in unauthorised demonstrations and those who arrive at demonstrations wearing face masks".
Mr Dettinger claimed he, his wife and a friend were tear-gassed and became angry when he saw police using similar tactics against pensioners and "hurting people with flash balls (rubber bullets)".
He said the government could model the new law on existing legislation against football hooligans whereby individuals can be banned from stadiums.
The government said that a new set-up would be announced ahead of Macron's proposed letter to the French people next Tuesday about why the debate was needed. Macron made multiple concessions that failed to extinguish the anger of the yellow vest movement, which is named after the fluorescent protective garments the protesters wear.
At the weekend, there were renewed yellow-vest protests after a lull over the festive period.
In a further attack to Macron's policies, Italian Interior Minister Matteo Salvini also commented that he supports "well-meaning citizens protesting against a president who governs against his own people".
Images of a policeman beating several protesters in the southern city of Toulon on Saturday were also widely condemned.
The French government has since toughened its stance and said it would crack down harder on undeclared protests and violence on the fringes of demonstrations.
Another huge security operation, involving 80,000 personnel, is planned for Saturday when the 10th weekly protests are due to be staged around France.
"Yellow vest" protests against fuel taxes began in rural and small-town France in late November, but then mushroomed into a wider revolt in December against the policies and governing style of 41-year-old Macron.