Test

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'Devamitbera_DisabledPgByCustomergroup',
    __DIR__
);

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Cron:etc/crontab.xsd">
    <group id="default">
        <job name="vendorname_modulename_cron_somecronmodel" instance="VendorName\ModuleName\Cron\SomeCronModel" method="execute">
            <schedule>* * * * *</schedule>
        </job>
     </group>
</config>

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Cron:etc/crontab.xsd">
     <group id="default">
       <job name="vendorname_modulename_cron_somecronmodel" instance="VendorName\ModuleName\Cron\SomeCronModel" method="execute">
          <schedule>* * * * *</schedule>
       </job>
     </group>
</config>

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="payment_method_is_active">
        <observer name="myObserverfor_disable_pg" instance="Devamitbera\DisabledFrontend\Observer\ObserverforDisabledPaymentgateway" />
    </event>
</config>