If we use of image upload site's like imgbb.com and other

Depends on the provider, A lot of people go with AWS cloud storage. However, be carefully checking your usage because you're not just paying for the storage usage but also for the bandwidth usage.

Sounds like an improper use of that site. Just store in storage. If you have paying customers that need more room use a good hosting provider do not go cheap with paying customers.

I suggest setting things up correctly so you don't have to worry about these things.

Only suggestions.

Imghippo (www.imghippo.com) is generally considered a reliable and free image hosting website. It will not effect SEO as this website feature is free for all users.

you can also try ( imagesupload.xyz ). it's also free and easy to use website