I host 50 tool sites on a free hosting platform, and I hit the bandwidth limit 3 times in a month. When you hit the limit, the provider throttles your site to 1kbps, which makes it unusable for visitors. I had to upgrade to a paid plan for 1 site, then downgrade after traffic dropped.
The other limit is build minutes per month. If you have 50 sites, that's 6 minutes per site — not enough for even a basic HTML deploy. I now use a single repo with 50 folders, and deploy each site as a separate branch to save build minutes.
If you're hosting multiple sites on free tier, watch your bandwidth. The limit goes fast if you have images or downloadable files.
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