The same thing happened with our other store.
Because we were in electronic recycling, many items came without batteries or chargers due to fire-risk concerns, so we had to source replacements ourselves. We eventually launched a private-label brand for generic camera batteries, drone batteries, power-tool batteries, chargers, and similar accessories.
Then Shopify unpublished those products too after Canon contacted them, claiming we were not allowed to sell them. But these were generic replacement products, the same kind of items sold by Anker and countless other electronics brands online.
If Canon believed we were doing something illegal, they could have sent a cease-and-desist and gone through the normal legal process. Instead, they went through Shopify’s back channels and effectively skirted due process, using platform pressure to remove products they simply did not want us selling.
But don’t worry, companies like Anker who have resources and pull can still sell them and have online websites. Again, the market is being manipulated and winners chosen.
Or were you doing something shady that was legitimate grounds for Shopify to remove those products? There's a big difference between what you personally think should be appropriate and what laws and compliance requirements consider. It's like the annual HN post about someone that claims Cloudflare shut down their account and eventually it turns out they were clearly doing something against the TOS.