Why was Quatararo able to keep racing after his crash?

I thought that a crash renders a rider out of that race. Why in the European GP was Quatararo able to get back on his bike and keep racing?

This isn't something requiring a separate thread. It should have been addressed within the thread about the race itself.

Oh well, we ain't exactly swamped with posts.

I haven't seen the race. If the bike is able to be ridden safely and competitively then why not.

To my knowledge there are no special rules about Quartararo, only Zarco. (If anybody crashes in proximity of Zarco then it is his fault.)

FIM World Championship Grand Prix Regulations

62 update 7 June 2020

2. Riders must ride in a responsible manner which does not cause danger
to other competitors or participants, either on the track or in the pitlane.
Any infringement of this rule may be penalised by the FIM MotoGP
Stewards.

3. Riders should use only the track and the pit-lane. However, if a rider
accidentally leaves the track then he may rejoin it at the place
indicated by the officials or at a place which does not provide an
advantage to him.
Any infringement of this rule during the practices or warm up will be
penalised by the cancellation of the lap time concerned and during the
race, by a penalty decided by the FIM MotoGP Stewards Panel.
Penalties imposed during a race will be communicated via
dashboard signals (where possible) and a board will be displayed for
the rider at the finish line during a maximum of 3 laps. If the rider
did not comply after the board has been presented 3 times, (5 times
in case of a 2 x Long Lap Penalty) they will be penalised by the FIM
MotoGP Stewards (penalties may include Long Lap, 2 x Long Lap,
Ride Through, Black Flag).
A time penalty may be imposed in lieu of a penalty where necessary.
Further penalties may also be imposed.

Grand Prix Commission, Losail 07/03/2020
Grand Prix Commission, Electronic meeting 20/04/2020

4. Any repairs or adjustments along the race track must be made by the
rider working alone with no outside assistance, except that rendered
by the marshals. The marshals may assist the rider to the extent of
helping him to lift the machine and holding it whilst any repairs or
adjustments are made. The rider may then be assisted by marshals
or others to re-start by pushing or to move the machine on track,
trackside or in the service road. No person other than marshals or
riders are permitted on the track side of the first line of protection.

5. If the rider intends to retire, then he must park his motorcycle in a
safe area as indicated by the marshals.

:good: Thanks Barbedwirebikerr.